Final answer:
A train operator should recognize the waving of a green lantern as a 'proceed' signal, although they should also be familiar with specific signaling protocols for their route to ensure safety and should consult with their dispatcher if uncertain.
Step-by-step explanation:
When a train operator sees an individual step out of the way of the train and wave a green lantern up and down, the operator should understand this as a signal. Historically, railway signals have used various colored lanterns to communicate different messages to train crews. In the context of railway signaling, a green lantern typically indicates 'all clear' or 'proceed,' according to traditional railway rules.
However, signal meanings can change based on location and railway company policy. Therefore, the train operator should be trained to recognize and understand the signaling protocol used on their specific route. It's crucial that the operator responds to signals properly to maintain the safety of the railway system. If any confusion arises, the operator should consult their company's rulebook or contact the dispatcher for clarity on the signal.