Final answer:
The least likely result of a train encountering a red signal is for it to continue without slowing down or stopping. Safety regulations require trains to stop at red signals, similar to vehicles at traffic lights, to prevent accidents.
Step-by-step explanation:
The question pertains to a train passing an automatic signal with a red aspect, which is analogous to a vehicle approaching a red traffic signal. In both scenarios, the expected behavior is to come to a complete stop. Therefore, the least likely result of a train passing a red signal is for it to continue at its current speed or accelerate, as this would be in direct violation of standard railway operation procedures, which prioritize safety.
In the case of the traffic signal for road vehicles, the primary purpose is to regulate traffic flow and ensure safety at intersections. A red signal universally means to stop, and most drivers adhere to this rule to prevent accidents. However, in extraordinary circumstances, such as a medical emergency, a driver might decide to disobey the signal after ensuring there are no immediate safety risks, as suggested by the reference to rule utilitarianism (RU) in one scenario provided.
Given that trains are operated on a fixed track and can't make such split-second decisions, adherence to signal aspects is crucial for preventing collisions and other accidents. Therefore, the expectation and most likely outcome when a train encounters a red signal is to come to a stop.