How does a track warrant differ from a token or block system?

• A. A track warrant is an authorization issued by a dispatcher for occupancy of a track segment within defined limits, whereas tokens or block systems grant movement through a fixed physical or signal-based mechanism.
• B. There is no difference; they are the same.
• C. A token system is automatic while a track warrant requires no dispatcher.
• D. A block system uses digital tokens only.

Answer: (D)

The main idea is how movement rights are granted and protected. In track warrant control, a dispatcher issues an authority to occupy a defined track segment with specific limits, speed, and conditions. This provides flexible, route-based authorization that isn’t bound to fixed physical blocks. In contrast, a token system relies on exchanging a physical or digital token to enter a block, and a block system divides the railroad into fixed segments whose occupancy is protected by signals and track circuits. The statement that a block system uses digital tokens only is not accurate, since block systems are built on fixed blocks and signaling, not exclusively on tokens. So the best description is that a track warrant is a dispatcher-issued authorization with defined limits, while tokens and block systems depend on fixed, physical or signal-based movement rights.