Code of Federal Regulations (Last Updated: November 8, 2024) |
Title 49 - Transportation |
Subtitle B - Other Regulations Relating to Transportation |
Chapter II - Federal Railroad Administration, Department of Transportation |
Part 213 - Track Safety Standards |
Appendix A to Part 213 - Maximum Allowable Curving Speeds
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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 [78 FR 16113, Mar. 13, 2013]