Which term denotes a place at which a block signal is displayed?

• A. Block Station
• B. Station
• C. Interlocking Station
• D. Block-Limit Station

Answer: (D)

Block signals mark the boundary of a defined block of track, showing whether the block ahead is clear. The place where those signals are displayed corresponds to the limits that define that block. In railroad terminology, that boundary is called the block-limits, and the location where the block signal is shown at the start of that block is known as a block-limit station. So this term directly names the spot where the signal is presented to the train driver. The other terms don’t specify that signaling boundary: a generic station, an interlocking station (which deals with route interlocks), or an informal “block station” don’t identify the actual block entry point where the signal is displayed.