{"data":{"id":"us/49-cfr-appendix-a-to-part-213","jurisdiction":"us","citation":"49 CFR Appendix A to Part 213","heading":"Appendix A to Part 213—Maximum Allowable Curving Speeds","body":"This appendix contains four tables identifying maximum allowing curving speeds based on 3, 4, 5, and 6 inches of unbalance (cant deficiency), respectively.\nTable 1—Three Inches Unbalance\nElevation of outer rail (inches)\n0 1⁄2 1 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 6\nDegree of curvature Maximum allowable operating speed (m.p.h.)\n0°30′ 93 100 107 113 120 125 131 136 141 146 151 156 160\n0°40′ 80 87 93 98 104 109 113 118 122 127 131 135 139\n0°50′ 72 77 83 88 93 97 101 106 110 113 117 121 124\n1°00′ 65 71 76 80 85 89 93 96 100 104 107 110 113\n1°15′ 59 63 68 72 76 79 83 86 89 93 96 99 101\n1°30′ 53 58 62 65 69 72 76 79 82 85 87 90 93\n1°45′ 49 53 57 61 64 67 70 73 76 78 81 83 86\n2°00′ 46 50 53 57 60 63 65 68 71 73 76 78 80\n2°15′ 44 47 50 53 56 59 62 64 67 69 71 73 76\n2°30′ 41 45 48 51 53 56 59 61 63 65 68 70 72\n2°45′ 39 43 46 48 51 53 56 58 60 62 64 66 68\n3°00′ 38 41 44 46 49 51 53 56 58 60 62 64 65\n3°15′ 36 39 42 44 47 49 51 53 55 57 59 61 63\n3°30′ 35 38 40 43 45 47 49 52 53 55 57 59 61\n3°45′ 34 37 39 41 44 46 48 50 52 53 55 57 59\n4°00′ 33 35 38 40 42 44 46 48 50 52 53 55 57\n4°30′ 31 33 36 38 40 42 44 45 47 49 50 52 53\n5°00′ 29 32 34 36 38 40 41 43 45 46 48 49 51\n5°30′ 28 30 32 34 36 38 39 41 43 44 46 47 48\n6°00′ 27 29 31 33 35 36 38 39 41 42 44 45 46\n6°30′ 26 28 30 31 33 35 36 38 39 41 42 43 44\n7°00′ 25 27 29 30 32 34 35 36 38 39 40 42 43\n8°00′ 23 25 27 28 30 31 33 34 35 37 38 39 40\n9°00′ 22 24 25 27 28 30 31 32 33 35 36 37 38\n10°00′ 21 22 24 25 27 28 29 30 32 33 34 35 36\n11°00′ 20 21 23 24 25 27 28 29 30 31 32 33 34\n12°00′ 19 20 22 23 24 26 27 28 29 30 31 32 33\nTable 2—Four Inches Unbalance\nElevation of outer rail (inches)\n0 1⁄2 1 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 6\nDegree of curvature Maximum allowable operating speed (m.p.h.)\n0°30′ 107 113 120 125 131 136 141 146 151 156 160 165 169\n0°40′ 93 98 104 109 113 118 122 127 131 135 139 143 146\n0°50′ 83 88 93 97 101 106 110 113 117 121 124 128 131\n1°00′ 76 80 85 89 93 96 100 104 107 110 113 116 120\n1°15′ 68 72 76 79 83 86 89 93 96 99 101 104 107\n1°30′ 62 65 69 72 76 79 82 85 87 90 93 95 98\n1°45′ 57 61 64 67 70 73 76 78 81 83 86 88 90\n2°00′ 53 57 60 63 65 68 71 73 76 78 80 82 85\n2°15′ 50 53 56 59 62 64 67 69 71 73 76 78 80\n2°30′ 48 51 53 56 59 61 63 65 68 70 72 74 76\n2°45′ 46 48 51 53 56 58 60 62 64 66 68 70 72\n3°00′ 44 46 49 51 53 56 58 60 62 64 65 67 69\n3°15′ 42 44 47 49 51 53 55 57 59 61 63 65 66\n3°30′ 40 43 45 47 49 52 53 55 57 59 61 62 64\n3°45′ 39 41 44 46 48 50 52 53 55 57 59 60 62\n4°00′ 38 40 42 44 46 48 50 52 53 55 57 58 60\n4°30′ 36 38 40 42 44 45 47 49 50 52 53 55 56\n5°00′ 34 36 38 40 41 43 45 46 48 49 51 52 53\n5°30′ 32 34 36 38 39 41 43 44 46 47 48 50 51\n6°00′ 31 33 35 36 38 39 41 42 44 45 46 48 49\n6°30′ 30 31 33 35 36 38 39 41 42 43 44 46 47\n7°00′ 29 30 32 34 35 36 38 39 40 42 43 44 45\n8°00′ 27 28 30 31 33 34 35 37 38 39 40 41 42\n9°00′ 25 27 28 30 31 32 33 35 36 37 38 39 40\n10°00′ 24 25 27 28 29 30 32 33 34 35 36 37 38\n11°00′ 23 24 25 27 28 29 30 31 32 33 34 35 36\n12°00′ 22 23 24 26 27 28 29 30 31 32 33 34 35\nTable 3—Five Inches Unbalance\nElevation of outer rail (inches)\n0 1⁄2 1 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 6\nDegree of curvature Maximum allowable operating speed (m.p.h.)\n0°30′ 120 125 131 136 141 146 151 156 160 165 169 173 177\n0°40′ 104 109 113 118 122 127 131 135 139 143 146 150 150\n0°50′ 93 97 101 106 110 113 117 121 124 128 131 134 137\n1°00′ 85 89 93 96 100 104 107 110 113 116 120 122 125\n1°15′ 76 79 83 86 89 93 96 99 101 104 107 110 112\n1°30′ 69 72 76 79 82 85 87 90 93 95 98 100 102\n1°45′ 64 67 70 73 76 78 81 83 86 88 90 93 95\n2°00′ 60 63 65 68 71 73 76 78 80 82 85 87 89\n2°15′ 56 59 62 64 67 69 71 73 76 78 80 82 84\n2°30′ 53 56 59 61 63 65 68 70 72 74 76 77 79\n2°45′ 51 53 56 58 60 62 64 66 68 70 72 74 76\n3°00′ 49 51 53 56 58 60 62 64 65 67 69 71 72\n3°15′ 47 49 51 53 55 57 59 61 63 65 66 68 70\n3°30′ 45 47 49 52 53 55 57 59 61 62 64 65 67\n3°45′ 44 46 48 50 52 53 55 57 59 60 62 63 65\n4°00′ 42 44 46 48 50 52 53 55 57 58 60 61 63\n4°30′ 40 42 44 45 47 49 50 52 53 55 56 58 59\n5°00′ 38 40 41 43 45 46 48 49 51 52 53 55 56\n5°30′ 36 38 39 41 43 44 46 47 48 50 51 52 53\n6°00′ 35 36 38 39 41 42 44 45 46 48 49 50 51\n6°30′ 33 35 36 38 39 41 42 43 44 46 47 48 49\n7°00′ 32 34 35 36 38 39 40 42 43 44 45 46 47\n8°00′ 30 31 33 34 35 37 38 39 40 41 42 43 44\n9°00′ 28 30 31 32 33 35 36 37 38 39 40 41 42\n10°00′ 27 28 29 30 32 33 34 35 36 37 38 39 40\n11°00′ 25 27 28 29 30 31 32 33 34 35 36 37 38\n12°00′ 24 26 27 28 29 30 31 32 33 34 35 35 36\nTable 4—Six Inches Unbalance\nElevation of outer rail (inches)\n0 1⁄2 1 11⁄2 2 21⁄2 3 31⁄2 4 41⁄2 5 51⁄2 6\nDegree of curvature Maximum allowable operating speed (m.p.h.)\n0°30′ 131 136 141 146 151 156 160 165 169 173 177 181 185\n0°40′ 113 118 122 127 131 135 139 143 146 150 154 157 160\n0°50′ 101 106 110 113 117 121 124 128 131 134 137 140 143\n1°00′ 93 96 100 104 107 110 113 116 120 122 125 128 131\n1°15′ 83 86 89 93 96 99 101 104 107 110 112 115 117\n1°30′ 76 79 82 85 87 90 93 95 98 100 102 105 107\n1°45′ 70 73 76 78 81 83 86 88 90 93 95 97 99\n2°00′ 65 68 71 73 76 78 80 82 85 87 89 91 93\n2°15′ 62 64 67 69 71 73 76 78 80 82 84 85 87\n2°30′ 59 61 63 65 68 70 72 74 76 77 79 81 83\n2°45′ 56 58 60 62 64 66 68 70 72 74 76 77 79\n3°00′ 53 56 58 60 62 64 65 67 69 71 72 74 76\n3°15′ 51 53 55 57 59 61 63 65 66 68 70 71 73\n3°30′ 49 52 53 55 57 59 61 62 64 65 67 69 70\n3°45′ 48 50 52 53 55 57 59 60 62 63 65 66 68\n4°00′ 46 48 50 52 53 55 57 58 60 61 63 64 65\n4°30′ 44 45 47 49 50 52 53 55 56 58 59 60 62\n5°00′ 41 43 45 46 48 49 51 52 53 55 56 57 59\n5°30′ 39 41 43 44 46 47 48 50 51 52 53 55 56\n6°00′ 38 39 41 42 44 45 46 48 49 50 51 52 53\n6°30′ 36 38 39 41 42 43 44 46 47 48 49 50 51\n7°00′ 35 36 38 39 40 42 43 44 45 46 47 48 49\n8°00′ 33 34 35 37 38 39 40 41 42 43 44 45 46\n9°00′ 31 32 33 35 36 37 38 39 40 41 42 43 44\n10°00′ 29 30 32 33 34 35 36 37 38 39 40 41 41\n11°00′ 28 29 30 31 32 33 34 35 36 37 38 39 39\n12°00′ 27 28 29 30 31 32 33 34 35 35 36 37 38","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 213—TRACK SAFETY STANDARDS"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"dbb07645d168c9d49688df0681054c1551d458b321620d51f11becb0085be60b","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-213.369","next":"us/49-cfr-appendixes-b-c-to-part-213"},"notice":"GroundRules: Original legal text. Not legal advice."}