Final answer:
When an express train is rerouted to local tracks, it should stop at all stations unless otherwise instructed, as local trains are expected to service every station along their route.
Step-by-step explanation:
When a train is diverted from its express tracks to local tracks, and unless there are specific instructions to the contrary, the standard operating procedure is for the train to make stops at all stations along the local route. Trains have very defined stopping patterns based on their designation as local or express. Since local trains traditionally halt at every station to pick up and drop off passengers, an express train rerouted to these tracks would adopt this pattern. Picture a busy commuter station where everyone is eager to board the train to reach their destination; having an express train skip stops just because it is not on its regular route would cause confusion and disruption.
However, this can vary depending on the specific rules of the railway system in question or the circumstances leading to the route deviation. Nevertheless, in the absence of other instructions, this practice ensures that passengers who depend on local trains are not inconvenienced by the unexpected presence of an express train.