After passing an Approach signal and reducing speed to 30 mph, you see a Clear signal ahead. After briefing with the crew, when can you resume speed?

• A. Immediately to the maximum speed of the train.
• B. Maintain 30 mph until the next signal changes.
• C. Resume at the top speed permitted by the signal.
• D. Wait for dispatcher permission before resuming any acceleration.

Answer: (C)

When a signal clears, you have authorization to proceed, but only up to the speed shown as allowed for that signal in the current block. After an Approach signal you were limited to 30 mph to ensure you can respond to the upcoming signal. Seeing a Clear signal means the restriction is lifted for the next block, so you may accelerate again—but to the top speed permitted by that signal for the area you’re entering. This keeps you within the official track speed limits and within safe stopping distances.

So the best approach is to resume at the maximum speed allowed by the signal you’ve just received, not the train’s absolute top speed or a fixed earlier limit. Dispatcher permission isn’t required for routine movement once the signal is Clear, and maintaining 30 mph would unnecessarily underutilize the line’s available speed.