93. Yard Limits
(This rule does not apply in CTC)
(a) A train or engine is authorized to use the main track within yard limits.
(b) Trains and engines must operate at reduced speed within yard limits, unless the main track is known to be clear. An ABS signal indication does not relieve a train or engine from the requirement of operating at reduced speed.
EXCEPTION: In ABS, unless otherwise directed by special instructions, or unless the train or engine has stopped or has been otherwise delayed in the block, “Clear Signal”, Rule 405, may be accepted by such train or engine as an indication that the track is clear, but only to the next signal or Block End sign.
(c) Each yard limit sign and advance sign will be reflectorized. Outside ABS, an advance sign will be placed at least one mile in advance of each yard limit sign. At locations where the placement of an advance sign or signs is not practicable at the required distance, it will be so indicated in special instructions.
93.1 Additional Restriction in Yard Limits
On a subdivision specified in the time table, in the application of reduced speed as required by Rule 93, a train or engine must also be prepared to stop short of a switch not properly lined.