Crossing type | Max. speed | Protection required |
(A) Interlocking-one or more PTC routes intersecting with one or more non-PTC routes | [LESS THAN EQUAL TO]40 miles per hour | Interlocking signal arrangement in accordance with the requirements of subparts A-G of this part and PTC enforced stop on PTC routes. |
(B) Interlocking-one or more PTC routes intersecting with one or more non-PTC routes | [GREATER THAN]40 miles per hour | Interlocking signal arrangement in accordance with the requirements of subparts A-G of this part, PTC enforced stop on all PTC routes, and either the use of other than full PTC technology that provides positive stop enforcement or a split-point derail incorporated into the signal system accompanied by 20 miles per hour maximum allowable speed on the approach of any intersecting non-PTC route. |
(C) Interlocking-all PTC routes intersecting | Any speed | Interlocking signal arrangements in accordance with the requirements of subparts A-G of this part, and PTC enforced stop on all routes. |
49 C.F.R. §236.1005