Fig. 17. - Running forward by night as an extra train. White flags at A A and white lights at B B.

Fig. 18. - Running backward by day as an extra train, without cars or at the rear of a train pushing cars. White flags at A A. Marker lamps not lighted, or yellow (or green) flags at B B as markers.

Fig. 19. - Running backward by night as an extra train, without cars or at the rear of a train pushing cars. White flags at A A. White lights at B B. Lights at C C as markers, showing yellow (or green) to side and in direction engine is moving and red in opposite direction.