Rule 303 — Protection against Following Trains or Transfers

1. (a)A combination of trains or transfers to a limit of two may each be authorized to proceed in the same direction, within the same limits, provided that each is instructed on its clearance to protect against the other. Before either moves within the limits stated, the conductor and locomotive engineer of each train or transfer must have a thorough understanding, in writing, as to the specific operation of each train or transfer and the protection to be provided. If communication fails between the trains or transfers affected, no moves shall be made other than those which were last arranged.
2. (b)WITHIN ABS TERRITORY With the protection of at least two block signals to the rear, two or more trains or transfers may be authorized to proceed in the same direction within the same limits governed by block signal indications.

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