Rule 401 — Location

Wherever practicable, fixed signals other than switches will be located above, or to the right of, the track they govern. Where circumstances require that signals be otherwise placed, such conditions will be indicated by GBO or special instructions.

EXCEPTION: A block or interlocking signal that is required to be placed to the left of the track it governs need not be indicated by GBO or special instructions, provided that such location does not place the signal to the right of another signalled track.