Federal regulations · Through 2026-08-25 · Newer source version available

49 CFR Appendix A to Part 213: 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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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

Where this section sits in the code

Title 49—Transportation
Subtitle B—Other Regulations Relating to Transportation
CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
PART 213—TRACK SAFETY STANDARDS

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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 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

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