How should movements be made if a train is moving in the opposite direction from which the block was entered?

When a train is moving in the opposite direction from which the block was entered, the procedures require that movements be made at restricted speed. This ensures that the train can stop quickly if necessary, allowing for safety in a potentially hazardous situation where the train's operations differ from standard expectations.

Moving at restricted speed means that the train must be able to stop short of any obstruction while maintaining control and awareness of its surroundings. It is especially critical as the leading wheels approach the next governing signal or the end of the block system, where the possibility of encountering another train or a signal indication could occur. This precaution minimizes the risk of accidents and ensures compliance with safety protocols.

The other options present strategies that do not adequately address the safety concerns associated with such a scenario. Normal speed with caution could lead to increased risk if unforeseen conditions arise. Stopping at the block entry and signaling for permission may also not be necessary if a clear procedure for restricted movement is established. Lastly, increased speed contradicts the fundamental safety principle of ensuring control and the ability to stop quickly, which is vital in railway operations.