Final answer:
The rule is in place to ensure safety in train operations by minimizing the risk of accidents and ensuring the train operator has enough information to make informed decisions.
Step-by-step explanation:
The rule that a train must not proceed on a hand signal as against fixed signal indications until the train operator is fully informed of the situation, and only after the train has come to a stop is in place to ensure safety in train operations. Fixed signal indications are set to provide clear and standardized instructions to train operators, based on the track conditions and other factors. Hand signals, on the other hand, can be more subjective and prone to misinterpretation.
By requiring the train operator to be fully informed of the situation before proceeding on a hand signal, the rule ensures that the operator has enough information to make an informed decision and can verify if the hand signal aligns with the fixed signal indications. Additionally, coming to a complete stop before proceeding allows the train operator to assess the situation and determine if it is safe to proceed.
Overall, these measures help minimize the risk of accidents and ensure the safe and efficient operation of trains.