Under general signal rules, which authority is Track Warrant Control with Automatic Block Signals (TWC-ABS)?

Under general signal rules, which authority is Track Warrant Control with Automatic Block Signals (TWC-ABS)?

• A. Track Warrant Control with Automatic Block Signals (TWC-ABS)
• B. Main Track Yard Limits Signaled (YL-S)
• C. Current of Traffic (COT) - Track Signaled in One Direction
• D. Traffic Control (TC)

Answer: (A)

Track Warrant Control with Automatic Block Signals means a dispatcher issues a track warrant that permits occupancy of a defined block, and Automatic Block Signals provide the protection for that movement. This combination is the exact way to describe movement authority when ABS is in place and warrants govern the entry and stay within the specified limits. That’s why this option fits best: it names the precise authority that combines a written or electronic warrant with ABS protection. Other terms describe different control schemes—yard-limits signaling, current-of-traffic in one direction, or general traffic control—each with its own rules and protections, not the TWC-ABS arrangement.

Track Warrant Control with Automatic Block Signals means a dispatcher issues a track warrant that permits occupancy of a defined block, and Automatic Block Signals provide the protection for that movement. This combination is the exact way to describe movement authority when ABS is in place and warrants govern the entry and stay within the specified limits. That’s why this option fits best: it names the precise authority that combines a written or electronic warrant with ABS protection. Other terms describe different control schemes—yard-limits signaling, current-of-traffic in one direction, or general traffic control—each with its own rules and protections, not the TWC-ABS arrangement.