Final answer:
The action by a train operator that would NOT be considered a violation of the rules is to follow the designated route.
Step-by-step explanation:
The action by a train operator that would NOT be considered a violation of the rules is to follow the designated route.
1) Speeding above the limit would be a violation of the rules as it exceeds the allowed speed limit.
2) Ignoring a red signal would be a violation of the rules as it puts the safety of the passengers and other vehicles at risk.
3) Using the horn excessively would also be a violation of the rules as it can be a nuisance to other people and may lead to noise pollution.
Therefore, the only action that would not be considered a violation of the rules is following the designated route.