Train speeds are authorized by the Operating Rules, Special Instructions and which of the following?

Train speeds are authorized by the Operating Rules, Special Instructions and which of the following?

• A. Dispatcher Message
• B. Signal Indication
• C. Timetable
• D. Crew Briefing

Answer: (B)

Speed in a block is governed by the signaling system. The signal indication shown to the crew directly communicates the current authorized speed for that segment, reflecting the track conditions and the authority of the signal itself. While operating rules and special instructions establish general rules and any temporary limits, and the timetable gives the published speeds for planned service, the actual, enforceable speed at any moment is the speed shown by the signal. Dispatcher messages can convey temporary authority in some cases, but they are not the standard source of immediate speed authorization in normal operation. Crew briefings convey safety and procedural information, not the exact speed limit for a specific block.

Speed in a block is governed by the signaling system. The signal indication shown to the crew directly communicates the current authorized speed for that segment, reflecting the track conditions and the authority of the signal itself. While operating rules and special instructions establish general rules and any temporary limits, and the timetable gives the published speeds for planned service, the actual, enforceable speed at any moment is the speed shown by the signal. Dispatcher messages can convey temporary authority in some cases, but they are not the standard source of immediate speed authorization in normal operation. Crew briefings convey safety and procedural information, not the exact speed limit for a specific block.