Tracks 4D & 5D share one westbound low home Je and are joined by an automatic safety switch on the west end. What is the device?

Tracks 4D & 5D share one westbound low home Je and are joined by an automatic safety switch on the west end. What is the device?

• A. A second signal
• B. A cross-over
• C. A manual switch
• D. An automatic safety switch

Answer: (D)

An automatic safety switch is the device that physically connects two tracks and can move under automatic control to route trains safely. In this setup, tracks 4D and 5D are joined on the west end by such a switch, which allows the signaling system to establish a safe route and prevent conflicting movements without manual operation. The other options don’t fit because a second signal provides only a visual instruction, a cross-over is a pair of turnouts enabling a route change between tracks rather than a single joining device, and a manual switch requires direct operator action rather than automatic operation.

An automatic safety switch is the device that physically connects two tracks and can move under automatic control to route trains safely. In this setup, tracks 4D and 5D are joined on the west end by such a switch, which allows the signaling system to establish a safe route and prevent conflicting movements without manual operation. The other options don’t fit because a second signal provides only a visual instruction, a cross-over is a pair of turnouts enabling a route change between tracks rather than a single joining device, and a manual switch requires direct operator action rather than automatic operation.