Crain's Scale / Gauge Encyclopedia
	C. 1993-2004  E. R. Crain   All Rights Reserved      Updated 15 Apr 2003 email us
	43	Scale Name:		Continental OO Scale
		Scale Ratio:		1:100
		Alternate Names:		OOC Scale			1 cm = 1 meter			("Oh-Oh-Cee")
				C Scale (C = 100)			D Scale (D = Decimal)			H Scale (H = Hundred)
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	43	1033	4ft 8.5in	56.5	100	0.120	3.05	0.565		14.35		0.0
	43	1034	Meter	39.4	100	0.120	3.05	0.394		10.01		0.0
	43	1035	3 Foot	36	100	0.120	3.05	0.360		9.14		0.0
	43	1036	2.5 Foot	30	100	0.120	3.05	0.300		7.62		0.0
	43	1037	2 Foot	24	100	0.120	3.05	0.240		6.10		0.0
	43	1038	15 Inch	15	100	0.120	3.05	0.150		3.81		0.0
		Commonly Used Gauges
	43	1039	OOC Gauge	56.5	100	0.120	3.05	0.563		14.30		-0.4
	43	1040	OOCm Gauge	39.4	100	0.120	3.05	0.394		10.00		0.0
	43	1041	HOO Gauge	39.4	100	0.120	3.05	0.394		10.00		0.0
	43	1042	N Gauge	39.4	100	0.120	3.05	0.353	0.367	8.97	9.32	-10.4	Nstd
	43	1043	Cn3 Gauge	36	100	0.120	3.05	0.353	0.367	8.97	9.32	-1.9	Nstd
	43	1044	N Gauge	36	100	0.120	3.05	0.353	0.367	8.97	9.32	-1.9	Nstd
	This is a rare European scale. The C in OOC stands for "Cent" - French for "Hundred".
	Some US modelers like this scale for 3 ft narrow gauge on N Gauge track.
	Crain's Scale / Gauge Encyclopedia
	44	Scale Name:		British TT Scale
		Scale Ratio:		1:102
		Alternate Names:		3 mm = 1 foot			3 mm Scale
				TM Scale			TT3 Scale			Scale 3
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	44	1045	4ft 8.5in	56.5	102	0.118	3.00	0.554		14.07		0.0
	44	1046	Meter	39.4	102	0.118	3.00	0.386		9.81		0.0
	44	1047	3 Foot	36	102	0.118	3.00	0.353		8.96		0.0
	44	1048	2.5 Foot	30	102	0.118	3.00	0.294		7.47		0.0
	44	1049	2 Foot	24	102	0.118	3.00	0.235		5.98		0.0
	44	1050	15 Inch	15	102	0.118	3.00	0.147		3.74		0.0
		Commonly Used Gauges
	44	1051	TT(Brit)	56.5	102	0.118	3.00	0.472		11.99		-14.8
	44	1052	102 / 12 Ga	56.5	102	0.118	3.00	0.472		11.99		-14.8
	44	1053	TM Gauge	56.5	102	0.118	3.00	0.531		13.49		-4.1
	44	1054	TT-3 Gauge	48	102	0.118	3.00	0.471	0.483	11.96	12.27	0.1	TTstd
	44	1055	TT Gauge	48	102	0.118	3.00	0.471	0.483	11.96	12.27	0.1	TTstd
	44	1056	TT-9 Gauge	36	102	0.118	3.00	0.353	0.367	8.97	9.32	0.0	Nstd
	44	1057	TTn3 Gauge	36	102	0.118	3.00	0.353	0.367	8.97	9.32	0.0	Nstd
	44	1058	9 mm Gauge	36	102	0.118	3.00	0.353	0.367	8.97	9.32	0.0	Nstd
	44	1059	N Gauge	36	102	0.118	3.00	0.353	0.367	8.97	9.32	0.0	Nstd
	As in OO Scale, British TT uses a larger scale to keep the locomotive narrow
	enough. However, some newer British outline is available at 1:120 (USA TT
	Scale). TM is the fine scale version.
	Crain's Scale / Gauge Encyclopedia
	45	Scale Name:		TT-X Scale
		Scale Ratio:		1:108
		Alternate Names:		1/9 inch = 1 foot			("Tee-Tee-Ex")
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	45	1060	4ft 8.5in	56.5	108	0.111	2.82	0.523		13.29		0.0
	45	1061	Meter	39.4	108	0.111	2.82	0.365		9.27		0.0
	45	1062	3 Foot	36	108	0.111	2.82	0.333		8.47		0.0
	45	1063	2.5 Foot	30	108	0.111	2.82	0.278		7.06		0.0
	45	1064	2 Foot	24	108	0.111	2.82	0.222		5.64		0.0
	45	1065	15 Inch	15	108	0.111	2.82	0.139		3.53		0.0
		Commonly Used Gauges
	45	1066	TT-X Gauge	56.5	108	0.111	2.82	0.471	0.483	11.96	12.27	-10.0	TTstd
	45	1067	TT Gauge	56.5	108	0.111	2.82	0.471	0.483	11.96	12.27	-10.0	TTstd
	45	1068	TT-Xm Ga	39.4	108	0.111	2.82	0.353	0.367	8.97	9.32	-3.2	Nstd
	45	1069	TT-9 Gauge	39.4	108	0.111	2.82	0.353	0.367	8.97	9.32	-3.2	Nstd
	45	1070	9 mm Gauge	39.4	108	0.111	2.82	0.353	0.367	8.97	9.32	-3.2	Nstd
	45	1071	N Gauge	39.4	108	0.111	2.82	0.353	0.367	8.97	9.32	-3.2	Nstd
	45	1072	TTn3 Gauge	36	108	0.111	2.82	0.353	0.367	8.97	9.32	5.9	Nstd
	45	1073	TT-9 Gauge	36	108	0.111	2.82	0.353	0.367	8.97	9.32	5.9	Nstd
	45	1074	9 mm Gauge	36	108	0.111	2.82	0.353	0.367	8.97	9.32	5.9	Nstd
	45	1075	N Gauge	36	108	0.111	2.82	0.353	0.367	8.97	9.32	5.9	Nstd
	This was an attempt a finer scale that did not sell.
	Crain's Scale / Gauge Encyclopedia
	46	Scale Name:		TT-J Scale
		Scale Ratio:		1:110
		Alternate Names:		1/9 inch = 1 foot			("Tee-Tee-Jay")
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	46	1076	4ft 8.5in	56.5	110	0.109	2.77	0.514		13.05		0.0
	46	1077	Meter	39.4	110	0.109	2.77	0.358		9.10		0.0
	46	1078	3 Foot	36	110	0.109	2.77	0.327		8.31		0.0
	46	1079	2.5 Foot	30	110	0.109	2.77	0.273		6.93		0.0
	46	1080	2 Foot	24	110	0.109	2.77	0.218		5.54		0.0
	46	1081	15 Inch	15	110	0.109	2.77	0.136		3.46		0.0
		Commonly Used Gauges
	46	1082	TT Gauge	56.5	110	0.109	2.77	0.471	0.483	11.96	12.27	-8.3	TTstd
	46	1083	TTj Gauge	56.5	110	0.109	2.77	0.471	0.483	11.96	12.27	-8.3	TTstd
	46	1084	110 / 12 Ga	56.5	110	0.109	2.77	0.471	0.483	11.96	12.27	-8.3	TTstd
	TT Gauge at a scale of 1:110 is used in Japan.
	Crain's Scale / Gauge Encyclopedia
	47	Scale Name:		USA TT Scale
		Scale Ratio:		1:120
		Alternate Names:		1/10 inch = 1 foot			2.5 mm Scale		2.5 mm = 1 foot
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	47	1085	4ft 8.5in	56.5	120	0.100	2.54	0.471		11.96		0.0
	47	1086	Meter	39.4	120	0.100	2.54	0.328		8.34		0.0
	47	1087	3.5 Foot	42	120	0.100	2.54	0.350		8.89		0.0
	47	1088	3 Foot	36	120	0.100	2.54	0.300		7.62		0.0
	47	1089	2.5 Foot	30	120	0.100	2.54	0.250		6.35		0.0
	47	1090	2 Foot	24	120	0.100	2.54	0.200		5.08		0.0
		Commonly Used Gauges			USA
	47	1091	TT Gauge	56.5	120	0.100	2.54	0.471	0.483	11.96	12.27	0.0	TTstd
	47	1092	TT Fine Ga	56.5	120	0.100	2.54	0.471	0.485	11.96	12.32	0.0	TTstd
	47	1093	120 / 12 Ga	56.5	120	0.100	2.54	0.471	0.485	11.96	12.32	0.0	TTstd
	47	1094	TTn3.5 Ga	42	120	0.100	2.54	0.353	0.367	8.97	9.32	0.9	Nstd
	47	1095	TT-9 Gauge	42	120	0.100	2.54	0.353	0.367	8.97	9.32	0.9	Nstd
	47	1096	9 mm Gauge	42	120	0.100	2.54	0.353	0.367	8.97	9.32	0.9	Nstd
	47	1097	N Gauge	42	120	0.100	2.54	0.353	0.367	8.97	9.32	0.9	Nstd
	47	1098	TTm Gauge	39.4	120	0.100	2.54	0.353	0.367	8.97	9.32	7.5	Nstd
	47	1099	120 / 9 Ga	39.4	120	0.100	2.54	0.353	0.367	8.97	9.32	7.5	Nstd
	47	1100	TTm Gauge	39.4	120	0.100	2.54	0.315		8.00		-4.1	Kstd
	47	1101	K Gauge	39.4	120	0.100	2.54	0.315		8.00		-4.1	Kstd
	47	1102	TTn3 Gauge	36	120	0.100	2.54	0.300	0.314	7.62	7.98	0.0	HOn2
	47	1103	HOn2 Gauge	36	120	0.100	2.54	0.276	0.29	7.01	7.37	-8.0	HOn2
	47	1104	TTn2.5 Ga	30	120	0.100	2.54	0.257	0.27	6.53	6.86	2.8	Zstd
	47	1105	TTz Gauge	30	120	0.100	2.54	0.257	0.27	6.53	6.86	2.8	Zstd
	47	1106	TTe Gauge	30	120	0.100	2.54	0.257	0.27	6.53	6.86	2.8	Zstd
	47	1107	Z Gauge	30	120	0.100	2.54	0.257	0.27	6.53	6.86	2.8	Zstd
	47	1108	TTm750 Ga	29.5	120	0.100	2.54	0.257	0.27	6.53	6.86	4.5	Zstd
	47	1109	TTe Gauge	29.5	120	0.100	2.54	0.257	0.27	6.53	6.86	4.5	Zstd
	47	1110	120 / 6.5 Ga	29.5	120	0.100	2.54	0.257	0.27	6.53	6.86	4.5	Zstd
	47	1111	TTn2 Gauge	24	120	0.100	2.54	0.200		5.08		0.0
	No longer widely available.
	Crain's Scale / Gauge Encyclopedia
	48	Scale Name:		HOO Scale
		Scale Ratio:		1:144
		Alternate Names:		1/12 inch = 1 foot			Centimetrico Scale				Micro-gauge
				("Aitch-Oh-Oh")
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	48	1112	4ft 8.5in	56.5	144	0.083	2.12	0.392		9.97		0.0
	48	1113	Meter	39.4	144	0.083	2.12	0.274		6.95		0.0
	48	1114	3 Foot	36	144	0.083	2.12	0.250		6.35		0.0
	48	1115	2.5 Foot	30	144	0.083	2.12	0.208		5.29		0.0
	48	1116	2 Foot	24	144	0.083	2.12	0.167		4.23		0.0
	48	1117	15 Inch	15	144	0.083	2.12	0.104		2.65		0.0
		Commonly Used Gauges
	48	1118	HOO Gauge	56.5	144	0.083	2.12	0.394		10.01		0.4
	48	1119	9 mm Gauge	56.5	144	0.083	2.12	0.353	0.367	8.97	9.32	-10.0	Nstd
	48	1120	N Gauge	56.5	144	0.083	2.12	0.353	0.367	8.97	9.32	-10.0	Nstd
	This is an early version of British N Scale, and is used in Sweden.
	Crain's Scale / Gauge Encyclopedia
	49	Scale Name:		British N Scale
		Scale Ratio:		1:148
		Alternate Names:		None
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	49	1121	4ft 8.5in	56.5	148	0.081	2.06	0.382		9.70		0.0
	49	1122	Meter	39.4	148	0.081	2.06	0.266		6.76		0.0
	49	1123	3 Foot	36	148	0.081	2.06	0.243		6.18		0.0
	49	1124	2.5 Foot	30	148	0.081	2.06	0.203		5.15		0.0
	49	1125	2 Foot	24	148	0.081	2.06	0.162		4.12		0.0
	49	1126	15 Inch	15	148	0.081	2.06	0.101		2.57		0.0
		Commonly Used Gauges
	49	1127	N (Brit)	56.5	148	0.081	2.06	0.353	0.367	8.97	9.32	-7.5	Nstd
	49	1128	9 mm Gauge	56.5	148	0.081	2.06	0.353	0.367	8.97	9.32	-7.5	Nstd
	49	1129	N Gauge	56.5	148	0.081	2.06	0.353	0.367	8.97	9.32	-7.5	Nstd
	49	1130	Nn3.5 Ga	42	148	0.081	2.06	0.257	0.27	6.53	6.86	-9.4	Zstd
	49	1131	Z Gauge	42	148	0.081	2.06	0.257	0.27	6.53	6.86	-9.4	Zstd
	49	1132	Nn40 Gauge	40	148	0.081	2.06	0.257	0.27	6.53	6.86	-4.9	Zstd
	49	1133	Z Gauge	40	148	0.081	2.06	0.257	0.27	6.53	6.86	-4.9	Zstd
	49	1134	Nm Gauge	39.4	148	0.081	2.06	0.257	0.27	6.53	6.86	-3.5	Zstd
	49	1135	Z Gauge	39.4	148	0.081	2.06	0.257	0.27	6.53	6.86	-3.5	Zstd
	49	1136	Nn3 Gauge	36	148	0.081	2.06	0.257	0.27	6.53	6.86	5.7	Zstd
	49	1137	Z Gauge	36	148	0.081	2.06	0.257	0.27	6.53	6.86	5.7	Zstd
	This scale uses commercial N Gauge track and rolling stock. A healthy
	controversy exists concerning the correct scale ratio for British N Scale -
	compare Tables 43, 44, and 45.
	Crain's Scale / Gauge Encyclopedia
	50	Scale Name:		Japanese N Scale
		Scale Ratio:		1:150
		Alternate Names:		None
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	50	1138	4ft 8.5in	56.5	150	0.080	2.03	0.377		9.57		0.0
	50	1139	Meter	39.4	150	0.080	2.03	0.263		6.67		0.0
	50	1140	3 Foot	36	150	0.080	2.03	0.240		6.10		0.0
	50	1141	2.5 Foot	30	150	0.080	2.03	0.200		5.08		0.0
	50	1142	2 Foot	24	150	0.080	2.03	0.160		4.06		0.0
	50	1143	15 Inch	15	150	0.080	2.03	0.100		2.54		0.0
		Commonly Used Gauges
	50	1144	N (Japan)	56.5	150	0.080	2.03	0.353	0.367	8.97	9.32	-6.3	Nstd
	50	1145	9 mm Gauge	56.5	150	0.080	2.03	0.353	0.367	8.97	9.32	-6.3	Nstd
	50	1146	N Gauge	56.5	150	0.080	2.03	0.353	0.367	8.97	9.32	-6.3	Nstd
	50	1147	Nn3.5 Ga	42	150	0.080	2.03	0.257	0.27	6.53	6.86	-8.2	Zstd
	50	1148	Z Gauge	42	150	0.080	2.03	0.257	0.27	6.53	6.86	-8.2	Zstd
	50	1149	Nn40 Gauge	40	150	0.080	2.03	0.257	0.27	6.53	6.86	-3.6	Zstd
	50	1150	Z Gauge	40	150	0.080	2.03	0.257	0.27	6.53	6.86	-3.6	Zstd
	50	1151	Nm Gauge	39.4	150	0.080	2.03	0.257	0.27	6.53	6.86	-2.2	Zstd
	50	1152	Z Gauge	39.4	150	0.080	2.03	0.257	0.27	6.53	6.86	-2.2	Zstd
	50	1153	Nn3 Gauge	36	150	0.080	2.03	0.257	0.27	6.53	6.86	7.1	Zstd
	50	1154	Z Gauge	36	150	0.080	2.03	0.257	0.27	6.53	6.86	7.1	Zstd
	This scale is used because of the smaller Japanese prototype. It was also used
	in Europe before 1960 when N Scale was defined as 1:160.
	Crain's Scale / Gauge Encyclopedia
	51	Scale Name:		2 mm Scale
		Scale Ratio:		1:152
		Alternate Names:		OOO Scale			Triple-Oh Scale			2 mm = 1 foot
				British N Fine Scale
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	51	1155	4ft 8.5in	56.5	152	0.079	2.00	0.372		9.44		0.0
	51	1156	Meter	39.4	152	0.079	2.00	0.259		6.58		0.0
	51	1157	3 Foot	36	152	0.079	2.00	0.237		6.02		0.0
	51	1158	2.5 Foot	30	152	0.079	2.00	0.197		5.01		0.0
	51	1159	2 Foot	24	152	0.079	2.00	0.158		4.01		0.0
	51	1160	15 Inch	15	152	0.079	2.00	0.099		2.51		0.0
		Commonly Used Gauges
	51	1161	N (2 mm)	56.5	152	0.079	2.00	0.372		9.45		0.1
	51	1162	N (2 mm)	56.5	152	0.079	2.00	0.371		9.42		-0.2
	51	1163	OOO Gauge	56.5	152	0.079	2.00	0.374		9.50		0.6
	51	1164	OOO-9 Ga	56.5	152	0.079	2.00	0.353	0.367	8.97	9.32	-5.0	Nstd
	51	1165	OOO9 Ga	56.5	152	0.079	2.00	0.353	0.367	8.97	9.32	-5.0	Nstd
	51	1166	N Gauge	56.5	152	0.079	2.00	0.353	0.367	8.97	9.32	-5.0	Nstd
	51	1167	Nn3.5 Ga	42	152	0.079	2.00	0.257	0.27	6.53	6.86	-7.0	Zstd
	51	1168	Z Gauge	42	152	0.079	2.00	0.257	0.27	6.53	6.86	-7.0	Zstd
	51	1169	Nn40 Gauge	40	152	0.079	2.00	0.257	0.27	6.53	6.86	-2.3	Zstd
	51	1170	Z Gauge	40	152	0.079	2.00	0.257	0.27	6.53	6.86	-2.3	Zstd
	51	1171	Nm Gauge	39.4	152	0.079	2.00	0.257	0.27	6.53	6.86	-0.9	Zstd
	51	1172	Z Gauge	39.4	152	0.079	2.00	0.257	0.27	6.53	6.86	-0.9	Zstd
	51	1173	Nn3 Gauge	36	152	0.079	2.00	0.257	0.27	6.53	6.86	8.5	Zstd
	51	1174	Z Gauge	36	152	0.079	2.00	0.257	0.27	6.53	6.86	8.5	Zstd
	This is a fine scale version of British N Scale.
	Crain's Scale / Gauge Encyclopedia
	52	Scale Name:		USA N Scale
		Scale Ratio:		1:160
		Alternate Names:		3/40 inch = 1 foot
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	52	1175	4ft 8.5in	56.5	160	0.075	1.91	0.353		8.97		0.0
	52	1176	Meter	39.4	160	0.075	1.91	0.246		6.25		0.0
	52	1177	3 Foot	36	160	0.075	1.91	0.225		5.72		0.0
	52	1178	2.5 Foot	30	160	0.075	1.91	0.188		4.76		0.0
	52	1179	2 Foot	24	160	0.075	1.91	0.150		3.81		0.0
	52	1180	15 Inch	15	160	0.075	1.91	0.094		2.38		0.0
		Commonly Used Gauges			USA
	52	1181	Nw5.5 Ga	66	160	0.075	1.91	0.413	0.429	10.49	10.90	0.1	HOn3
	52	1182	N Broad	66	160	0.075	1.91	0.413	0.429	10.49	10.90	0.1	HOn3
	52	1183	N Hi-Rail	56.5	160	0.075	1.91	0.354	0.358	8.99	9.09	0.2	Nstd
	52	1184	9 mm Gauge	56.5	160	0.075	1.91	0.353	0.367	8.97	9.32	0.0	Nstd
	52	1185	N Gauge	56.5	160	0.075	1.91	0.353	0.367	8.97	9.32	0.0	Nstd
	52	1186	N Fine Ga	56.5	160	0.075	1.91	0.353	0.366	8.97	9.30	0.0	Nstd
	52	1187	Nn3.5 Ga	42	160	0.075	1.91	0.257	0.270	6.53	6.86	-2.1	Zstd
	52	1188	Z Gauge	42	160	0.075	1.91	0.257	0.270	6.53	6.86	-2.1	Zstd
	52	1189	Nn40 Gauge	40	160	0.075	1.91	0.257	0.270	6.53	6.86	2.8	Zstd
	52	1190	Z Gauge	40	160	0.075	1.91	0.257	0.270	6.53	6.86	2.8	Zstd
	52	1191	Nm Gauge	39.4	160	0.075	1.91	0.257	0.270	6.53	6.86	4.4	Zstd
	52	1192	Z Gauge	39.4	160	0.075	1.91	0.257	0.270	6.53	6.86	4.4	Zstd
	52	1193	Nn3 Gauge	36	160	0.075	1.91	0.225		5.72		0.0
	52	1194	Nn2.5 Ga	30	160	0.075	1.91	0.188		4.78		0.3
	52	1195	Nf Gauge	23.6	160	0.075	1.91	0.148		3.76		0.3
	52	1196	Nn2 Gauge	24	160	0.075	1.91	0.150		3.81		0.0
	Again, the British scale is larger to accomodate their smaller locomotives.
	However, most ready to run equipment is made in Europe or Asia to American
	standards. Nearly 10% of modelers in USA work in N Scale, leaving only 40% in
	all other scales except HO. The "N" in N Scale came from Nine millimeter track
	gauge. Nn3 uses Z gauge track - the smallest practical narrow gauge.
	Crain's Scale / Gauge Encyclopedia
	53	Scale Name:		HHO Scale
		Scale Ratio:		1:174
		Alternate Names:		HH Scale			Some sources call this scale QOO -see Table 55
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	53	1197	4ft 8.5in	56.5	174	0.069	1.75	0.325		8.25		0.0
	53	1198	Meter	39.4	174	0.069	1.75	0.226		5.75		0.0
	53	1199	3 Foot	36	174	0.069	1.75	0.207		5.26		0.0
	53	1200	2.5 Foot	30	174	0.069	1.75	0.172		4.38		0.0
	53	1201	2 Foot	24	174	0.069	1.75	0.138		3.50		0.0
	53	1202	15 Inch	15	174	0.069	1.75	0.086		2.19		0.0
		Commonly Used Gauges
	53	1203	QOO Gauge	56.5	174	0.069	1.75	0.3		7.62		-7.6
	53	1204	QOO Gauge	56.5	174	0.069	1.75	0.313		7.95		-3.6
	HHO is one half the size of HO Scale – very rare.
	Crain's Scale / Gauge Encyclopedia
	54	Scale Name:		K Scale
		Scale Ratio:		1:180
		Alternate Names:		1/15 inch = 1 foot
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	54	1205	4ft 8.5in	56.5	180	0.067	1.69	0.314		7.97		0.0
	54	1206	Meter	39.4	180	0.067	1.69	0.219		5.56		0.0
	54	1207	3 Foot	36	180	0.067	1.69	0.200		5.08		0.0
	54	1208	2.5 Foot	30	180	0.067	1.69	0.167		4.23		0.0
	54	1209	2 Foot	24	180	0.067	1.69	0.133		3.39		0.0
	54	1210	15 Inch	15	180	0.067	1.69	0.083		2.12		0.0
		Commonly Used Gauges
	54	1211	K Gauge	56.5	180	0.067	1.69	0.315		8.00		0.4	Kstd
	Very rare European scale.
	Crain's Scale / Gauge Encyclopedia
	55	Scale Name:		QOO Scale
		Scale Ratio:		1:192		Half of OO Scale (1:96)
		Alternate Names:		1/16 inch = 1 ft		"Que-Oh-Oh"			1/16 inch = 1 foot
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	55	1212	4ft 8.5in	56.5	192	0.063	1.59	0.294		7.47		0.0
	55	1213	Meter	39.4	192	0.063	1.59	0.205		5.21		0.0
	55	1214	3 Foot	36	192	0.063	1.59	0.188		4.76		0.0
	55	1215	2.5 Foot	30	192	0.063	1.59	0.156		3.97		0.0
	55	1216	2 Foot	24	192	0.063	1.59	0.125		3.18		0.0
	55	1217	15 Inch	15	192	0.063	1.59	0.078		1.98		0.0
		Commonly Used Gauges
	55	1218	?? Gauge	56.5	192	0.063	1.59	0.315		8.00		7.0
	55	1219	?? Gauge	36	192	0.063	1.59	0.178		4.52		-5.1
	Yup – a second reference to QOO scale – see Table 53.
	Working models were first shown in 1938 - A-mazing!!!
	Crain's Scale / Gauge Encyclopedia
	56	Scale Name:		Y Scale
		Scale Ratio:		1:200
		Alternate Names:		Scale is actually un-named.
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	56	1220	4ft 8.5in	56.5	200	0.060	1.52	0.283		7.18		0.0
	56	1221	Meter	39.4	200	0.060	1.52	0.197		5.00		0.0
	56	1222	3 Foot	36	200	0.060	1.52	0.180		4.57		0.0
	56	1223	2.5 Foot	30	200	0.060	1.52	0.150		3.81		0.0
	56	1224	2 Foot	24	200	0.060	1.52	0.120		3.05		0.0
	56	1225	15 Inch	15	200	0.060	1.52	0.075		1.91		0.0
		Commonly Used Gauges
	56	1226	9 mm Gauge	56.5	200	0.060	1.52	0.353	0.367	8.97	9.32	25.0	Nstd
	Only one mention in the literature.
	Crain's Scale / Gauge Encyclopedia
	57	Scale Name:		Z Scale
		Scale Ratio:		1:220
		Alternate Names:		7/128 inch = 1 foot
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	57	1227	4ft 8.5in	56.5	220	0.055	1.39	0.257		6.52		0.0
	57	1228	Meter	39.4	220	0.055	1.39	0.179		4.55		0.0
	57	1229	3 Foot	36	220	0.055	1.39	0.164		4.16		0.0
	57	1230	2.5 Foot	30	220	0.055	1.39	0.136		3.46		0.0
	57	1231	2 Foot	24	220	0.055	1.39	0.109		2.77		0.0
	57	1232	15 Inch	15	220	0.055	1.39	0.068		1.73		0.0
		Commonly Used Gauges
	57	1233	Z Gauge	56.5	220	0.055	1.39	0.257	0.27	6.53	6.86	0.1	Zstd
	57	1234	Zm Gauge	39.4	220	0.055	1.39	0.179		4.55		0.0
	Lots of neat stuff in this scale, and it works!
	Crain's Scale / Gauge Encyclopedia
	58	Scale Name:		TTT Scale
		Scale Ratio:		1:240
		Alternate Names:		1/20 inch = 1 foot (half the size of TT Scale)
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	58	1235	4ft 8.5in	56.5	240	0.050	1.27	0.235		5.98		0.0
	58	1236	Meter	39.4	240	0.050	1.27	0.164		4.17		0.0
	58	1237	3 Foot	36	240	0.050	1.27	0.150		3.81		0.0
	58	1238	2.5 Foot	30	240	0.050	1.27	0.125		3.18		0.0
	58	1239	2 Foot	24	240	0.050	1.27	0.100		2.54		0.0
	58	1240	15 Inch	15	240	0.050	1.27	0.063		1.59		0.0
		Commonly Used Gauges
	58	1241	TTT Gauge	56.5	240	0.050	1.27	0.236		6.00		0.2
	This was a proposed scale at one half TT scale. It was never manufactured.
	Crain's Scale / Gauge Encyclopedia
	59	Scale Name:		1:300 Scale
		Scale Ratio:		1:300
		Alternate Names:		M Scale (This name is currently used for 1:13.5 Scale)
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	59	1242	4ft 8.5in	56.5	300	0.040	1.02	0.188		4.78		0.0
	59	1243	Meter	39.4	300	0.040	1.02	0.131		3.34		0.0
	59	1244	3 Foot	36	300	0.040	1.02	0.120		3.05		0.0
	59	1245	2.5 Foot	30	300	0.040	1.02	0.100		2.54		0.0
	59	1246	2 Foot	24	300	0.040	1.02	0.080		2.03		0.0
	59	1247	15 Inch	15	300	0.040	1.02	0.050		1.27		0.0
		Commonly Used Gauges
	59	1248	?? Gauge	56.5	300	0.040	1.02	0.197		5.00		4.6
	Sources are not clear as to scale name or manufacturer.
	Crain's Scale / Gauge Encyclopedia
	60	Scale Name:		X Scale
		Scale Ratio:		1:305
		Alternate Names:		1 mm = 1 foot
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	60	1249	4ft 8.5in	56.5	305	0.039	1.00	0.185		4.71		0.0
	60	1250	Meter	39.4	305	0.039	1.00	0.129		3.28		0.0
	60	1251	3 Foot	36	305	0.039	1.00	0.118		3.00		0.0
	60	1252	2.5 Foot	30	305	0.039	1.00	0.098		2.50		0.0
	60	1253	2 Foot	24	305	0.039	1.00	0.079		2.00		0.0
		Commonly Used Gauges
	60	1254	X Gauge	56.5	305	0.039	1.00	0.188		4.78		1.5
	Only one mention in the literature for this eXtra small scale, Built 1935!! Used 2 volt DC motor.
	Crain's Scale / Gauge Encyclopedia
	61	Scale Name:		X1 Scale
		Scale Ratio:		1:384
		Alternate Names:		1/32 inch = 1 foot
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	61	1255	4ft 8.5in	56.5	384	0.031	0.79	0.147		3.74		0.0
	61	1256	Meter	39.4	384	0.031	0.79	0.103		2.61		0.0
	61	1257	3 Foot	36	384	0.031	0.79	0.094		2.38		0.0
	61	1258	2.5 Foot	30	384	0.031	0.79	0.078		1.98		0.0
	61	1259	2 Foot	24	384	0.031	0.79	0.063		1.59		0.0
		Commonly Used Gauges
	61	1260	X1 Gauge	56.5	384	0.031	0.79	0.147		3.74		0.0
	Only one mention in the literature for this eXtra small scale. It was powered by air. 1982.
	Crain's Scale / Gauge Encyclopedia
	62	Scale Name:		HZ Scale
		Scale Ratio:		1:440
		Alternate Names:		None	(Half the size of Z Scale)
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	62	1261	4ft 8.5in	56.5	440	0.027	0.69	0.128		3.26		0.0
	62	1262	Meter	39.4	440	0.027	0.69	0.090		2.27		0.0
	62	1263	3 Foot	36	440	0.027	0.69	0.082		2.08		0.0
	62	1264	2.5 Foot	30	440	0.027	0.69	0.068		1.73		0.0
	62	1265	2 Foot	24	440	0.027	0.69	0.055		1.39		0.0
	62	1266	15 Inch	15	440	0.027	0.69	0.034		0.87		0.0
		Commonly Used Gauges
	62	1267	HZ Gauge	56.5	440	0.027	0.69	0.128		3.25		-0.3
	This is one half of Z scale – very rare.
	Crain's Scale / Gauge Encyclopedia
	63	Scale Name:		ZZ Scale
		Scale Ratio:		1:480
		Alternate Names:		Scale is actually not named.
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	63	1268	4ft 8.5in	56.5	480	0.025	0.64	0.118		2.99		0.0
	63	1269	Meter	39.4	480	0.025	0.64	0.082		2.08		0.0
	63	1270	3 Foot	36	480	0.025	0.64	0.075		1.91		0.0
	63	1271	2.5 Foot	30	480	0.025	0.64	0.063		1.59		0.0
		Commonly Used Gauges
	63	1272	ZZ Gauge	56.5	480	0.025	0.64	0.118		3.00		0.2
	Again, only one example is mentioned, from Australia. Not for the clumsy or
	timid. A cartoon showing a ZZZZ scale locomotive in a watch appeared recently.
	Crain's Scale / Gauge Encyclopedia
	64	Scale Name:		ZZZ Scale
		Scale Ratio:		1:720
		Alternate Names:		Scale is actually not named.
			Represented			Scale		Model Track Gauge				Error	Track
		Ser #	Gauge	Inches	Ratio	In/ft	mm/ft	Inches		mm		%	Used
		Correct Gauge:
	64	1273	4ft 8.5in	56.5	720	0.017	0.42	0.078		1.99		0.0
	64	1274	Meter	39.4	720	0.017	0.42	0.055		1.39		0.0
	64	1275	3 Foot	36	720	0.017	0.42	0.050		1.27		0.0
	64	1276	2.5 Foot	30	720	0.017	0.42	0.042		1.06		0.0
		Commonly Used Gauges
	64	1277	ZZ Gauge	56.5	720	0.017	0.42	0.08		2.03		1.9
	A commercially available, fully sceniced, fully operational model is sold. The train follows a track
	but is pulled by a belt.
	Crain's Scale / Gauge Encyclopedia
	C. 1993-2004  E. R. Crain   All Rights Reserved      Updated 15 Apr 2003 email us