Rule 123.2 — Switching by Radio

1. (i)direction in relation to the front of the controlling locomotive must be given in the initial instruction and from then on whenever the direction is to change;
2. (ii)distance to travel must be given with each communication and increments of less than two car lengths need not be repeated;
3. (iii)when the movement has travelled one-half the distance required by the last instruction and no further communication is received, the movement must stop;
4. (iv)the indication of block and interlocking signals affecting their movement, must be communicated between crew members while switching;
5. (v)doubt as to the meaning of an instruction or for whom it is intended must be regarded as a stop signal; and
6. (vi)when car lengths are used to communicate distance, unless otherwise arranged, the distance referred to is 50 feet per car length.

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