FM 55-21 - Railway Operating and Safety Rules

train order Form F, example (4) to protect rear as prescribed by rule. A train must not permit a following train to pass without train order authority. Trains may pass or be passed by work extras without such authority. When work extras are authorized, all trains operating within the limits must be furnished a copy of the work orders.

(5) Specific Flagging Instructions. When conditions require that a flagman be sent with specific instructions affecting the movement of a train, such instructions must be in writing. When sent on a train, he must ride the engine and show flagging instructions to the engineer, who must let him off at the location from which protection is to be provided.

(6) Acknowledge When Flagged. When flagged, the engineer must acknowledge stop signals promptly.

Flagman must continue giving stop signals until such signals are acknowledged and acted upon. After stopping, the engineer must be informed of the reason for being flagged and be governed accordingly.

(7) Crossing Over or Fouling. When a train crosses over to, or obstructs another main track signaled for movement in one direction, flag protection against movements against the current of traffic, as prescribed by rule, must be provided unless advice is received from the train dispatcher that no movements against the current of traffic have been, or will be authorized.

When the crew has received this advice they must notify the train dispatcher when their movement is clear of the other main track.

(8) Protection in ABS by Lining Switch. When a train or engine is within ABS limits and flag protection is 53