Code of Federal Regulations > Title 49 > Chapter II > Part 213 > Appendix Appendix A - Appendix A to Part 213

Regulations last checked for updates: May 18, 2024

Title 49 - Transportation last revised: May 14, 2024

Appendix Appendix A - Appendix A to Part 213—Maximum Allowable Curving Speeds

This appendix contains four tables identifying maximum allowing curving speeds based on 3, 4, 5, and 6 inches of unbalance (cant deficiency), respectively.

Table 1—Three Inches Unbalance

	Elevation of outer rail (inches)
	0	1/2	1	1 1/2	2	2 1/2	3	3 1/2	4	4 1/2	5	5 1/2	6
Degree of curvature	Maximum allowable operating speed (m.p.h.)
0°30′	93	100	107	113	120	125	131	136	141	146	151	156	160
0°40′	80	87	93	98	104	109	113	118	122	127	131	135	139
0°50′	72	77	83	88	93	97	101	106	110	113	117	121	124
1°00′	65	71	76	80	85	89	93	96	100	104	107	110	113
1°15′	59	63	68	72	76	79	83	86	89	93	96	99	101
1°30′	53	58	62	65	69	72	76	79	82	85	87	90	93
1°45′	49	53	57	61	64	67	70	73	76	78	81	83	86
2°00′	46	50	53	57	60	63	65	68	71	73	76	78	80
2°15′	44	47	50	53	56	59	62	64	67	69	71	73	76
2°30′	41	45	48	51	53	56	59	61	63	65	68	70	72
2°45′	39	43	46	48	51	53	56	58	60	62	64	66	68
3°00′	38	41	44	46	49	51	53	56	58	60	62	64	65
3°15′	36	39	42	44	47	49	51	53	55	57	59	61	63
3°30′	35	38	40	43	45	47	49	52	53	55	57	59	61
3°45′	34	37	39	41	44	46	48	50	52	53	55	57	59
4°00′	33	35	38	40	42	44	46	48	50	52	53	55	57
4°30′	31	33	36	38	40	42	44	45	47	49	50	52	53
5°00′	29	32	34	36	38	40	41	43	45	46	48	49	51
5°30′	28	30	32	34	36	38	39	41	43	44	46	47	48
6°00′	27	29	31	33	35	36	38	39	41	42	44	45	46
6°30′	26	28	30	31	33	35	36	38	39	41	42	43	44
7°00′	25	27	29	30	32	34	35	36	38	39	40	42	43
8°00′	23	25	27	28	30	31	33	34	35	37	38	39	40
9°00′	22	24	25	27	28	30	31	32	33	35	36	37	38
10°00′	21	22	24	25	27	28	29	30	32	33	34	35	36
11°00′	20	21	23	24	25	27	28	29	30	31	32	33	34
12°00′	19	20	22	23	24	26	27	28	29	30	31	32	33

Table 2—Four Inches Unbalance

	Elevation of outer rail (inches)
	0	1/2	1	1 1/2	2	2 1/2	3	3 1/2	4	4 1/2	5	5 1/2	6
Degree of curvature	Maximum allowable operating speed (m.p.h.)
0°30′	107	113	120	125	131	136	141	146	151	156	160	165	169
0°40′	93	98	104	109	113	118	122	127	131	135	139	143	146
0°50′	83	88	93	97	101	106	110	113	117	121	124	128	131
1°00′	76	80	85	89	93	96	100	104	107	110	113	116	120
1°15′	68	72	76	79	83	86	89	93	96	99	101	104	107
1°30′	62	65	69	72	76	79	82	85	87	90	93	95	98
1°45′	57	61	64	67	70	73	76	78	81	83	86	88	90
2°00′	53	57	60	63	65	68	71	73	76	78	80	82	85
2°15′	50	53	56	59	62	64	67	69	71	73	76	78	80
2°30′	48	51	53	56	59	61	63	65	68	70	72	74	76
2°45′	46	48	51	53	56	58	60	62	64	66	68	70	72
3°00′	44	46	49	51	53	56	58	60	62	64	65	67	69
3°15′	42	44	47	49	51	53	55	57	59	61	63	65	66
3°30′	40	43	45	47	49	52	53	55	57	59	61	62	64
3°45′	39	41	44	46	48	50	52	53	55	57	59	60	62
4°00′	38	40	42	44	46	48	50	52	53	55	57	58	60
4°30′	36	38	40	42	44	45	47	49	50	52	53	55	56
5°00′	34	36	38	40	41	43	45	46	48	49	51	52	53
5°30′	32	34	36	38	39	41	43	44	46	47	48	50	51
6°00′	31	33	35	36	38	39	41	42	44	45	46	48	49
6°30′	30	31	33	35	36	38	39	41	42	43	44	46	47
7°00′	29	30	32	34	35	36	38	39	40	42	43	44	45
8°00′	27	28	30	31	33	34	35	37	38	39	40	41	42
9°00′	25	27	28	30	31	32	33	35	36	37	38	39	40
10°00′	24	25	27	28	29	30	32	33	34	35	36	37	38
11°00′	23	24	25	27	28	29	30	31	32	33	34	35	36
12°00′	22	23	24	26	27	28	29	30	31	32	33	34	35

Table 3—Five Inches Unbalance

	Elevation of outer rail (inches)
	0	1/2	1	1 1/2	2	2 1/2	3	3 1/2	4	4 1/2	5	5 1/2	6
Degree of curvature	Maximum allowable operating speed (m.p.h.)
0°30′	120	125	131	136	141	146	151	156	160	165	169	173	177
0°40′	104	109	113	118	122	127	131	135	139	143	146	150	150
0°50′	93	97	101	106	110	113	117	121	124	128	131	134	137
1°00′	85	89	93	96	100	104	107	110	113	116	120	122	125
1°15′	76	79	83	86	89	93	96	99	101	104	107	110	112
1°30′	69	72	76	79	82	85	87	90	93	95	98	100	102
1°45′	64	67	70	73	76	78	81	83	86	88	90	93	95
2°00′	60	63	65	68	71	73	76	78	80	82	85	87	89
2°15′	56	59	62	64	67	69	71	73	76	78	80	82	84
2°30′	53	56	59	61	63	65	68	70	72	74	76	77	79
2°45′	51	53	56	58	60	62	64	66	68	70	72	74	76
3°00′	49	51	53	56	58	60	62	64	65	67	69	71	72
3°15′	47	49	51	53	55	57	59	61	63	65	66	68	70
3°30′	45	47	49	52	53	55	57	59	61	62	64	65	67
3°45′	44	46	48	50	52	53	55	57	59	60	62	63	65
4°00′	42	44	46	48	50	52	53	55	57	58	60	61	63
4°30′	40	42	44	45	47	49	50	52	53	55	56	58	59
5°00′	38	40	41	43	45	46	48	49	51	52	53	55	56
5°30′	36	38	39	41	43	44	46	47	48	50	51	52	53
6°00′	35	36	38	39	41	42	44	45	46	48	49	50	51
6°30′	33	35	36	38	39	41	42	43	44	46	47	48	49
7°00′	32	34	35	36	38	39	40	42	43	44	45	46	47
8°00′	30	31	33	34	35	37	38	39	40	41	42	43	44
9°00′	28	30	31	32	33	35	36	37	38	39	40	41	42
10°00′	27	28	29	30	32	33	34	35	36	37	38	39	40
11°00′	25	27	28	29	30	31	32	33	34	35	36	37	38
12°00′	24	26	27	28	29	30	31	32	33	34	35	35	36

Table 4—Six Inches Unbalance

	Elevation of outer rail (inches)
	0	1/2	1	1 1/2	2	2 1/2	3	3 1/2	4	4 1/2	5	5 1/2	6
Degree of curvature	Maximum allowable operating speed (m.p.h.)
0°30′	131	136	141	146	151	156	160	165	169	173	177	181	185
0°40′	113	118	122	127	131	135	139	143	146	150	154	157	160
0°50′	101	106	110	113	117	121	124	128	131	134	137	140	143
1°00′	93	96	100	104	107	110	113	116	120	122	125	128	131
1°15′	83	86	89	93	96	99	101	104	107	110	112	115	117
1°30′	76	79	82	85	87	90	93	95	98	100	102	105	107
1°45′	70	73	76	78	81	83	86	88	90	93	95	97	99
2°00′	65	68	71	73	76	78	80	82	85	87	89	91	93
2°15′	62	64	67	69	71	73	76	78	80	82	84	85	87
2°30′	59	61	63	65	68	70	72	74	76	77	79	81	83
2°45′	56	58	60	62	64	66	68	70	72	74	76	77	79
3°00′	53	56	58	60	62	64	65	67	69	71	72	74	76
3°15′	51	53	55	57	59	61	63	65	66	68	70	71	73
3°30′	49	52	53	55	57	59	61	62	64	65	67	69	70
3°45′	48	50	52	53	55	57	59	60	62	63	65	66	68
4°00′	46	48	50	52	53	55	57	58	60	61	63	64	65
4°30′	44	45	47	49	50	52	53	55	56	58	59	60	62
5°00′	41	43	45	46	48	49	51	52	53	55	56	57	59
5°30′	39	41	43	44	46	47	48	50	51	52	53	55	56
6°00′	38	39	41	42	44	45	46	48	49	50	51	52	53
6°30′	36	38	39	41	42	43	44	46	47	48	49	50	51
7°00′	35	36	38	39	40	42	43	44	45	46	47	48	49
8°00′	33	34	35	37	38	39	40	41	42	43	44	45	46
9°00′	31	32	33	35	36	37	38	39	40	41	42	43	44
10°00′	29	30	32	33	34	35	36	37	38	39	40	41	41
11°00′	28	29	30	31	32	33	34	35	36	37	38	39	39
12°00′	27	28	29	30	31	32	33	34	35	35	36	37	38

[78 FR 16113, Mar. 13, 2013]

authority: 49 U.S.C. 20102-20114 and 20142; 28 U.S.C. 2461 note; and 49 CFR 1.89

source: 63 FR 34029, June 22, 1998, unless otherwise noted.