StacksVerified U.S. regulatory reference

49 CFR Part 213, Appendix A

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov

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

Elevation of outer rail (inches)
01⁄2 | 1 | 11⁄2 | 2 | 21⁄2 | 3 | 31⁄2 | 4 | 41⁄2 | 5 | 51⁄2 | 6
Degree of curvatureMaximum 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
Elevation of outer rail (inches)
01⁄2 | 1 | 11⁄2 | 2 | 21⁄2 | 3 | 31⁄2 | 4 | 41⁄2 | 5 | 51⁄2 | 6
Degree of curvatureMaximum 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
Elevation of outer rail (inches)
01⁄2 | 1 | 11⁄2 | 2 | 21⁄2 | 3 | 31⁄2 | 4 | 41⁄2 | 5 | 51⁄2 | 6
Degree of curvatureMaximum 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
Elevation of outer rail (inches)
01⁄2 | 1 | 11⁄2 | 2 | 21⁄2 | 3 | 31⁄2 | 4 | 41⁄2 | 5 | 51⁄2 | 6
Degree of curvatureMaximum 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]