Final answer:
An express train rerouted to local tracks should stop at all local stations unless instructed otherwise for safety and adherence to local schedules.
Step-by-step explanation:
When an express train is rerouted to local tracks because of a blockade, it has to adapt to the rules that govern the local service. Local tracks typically service all the stations along the route. Therefore, unless the train crew is given specific instructions otherwise, the express train should stop at all local stations along its new route. This ensures that the train operates safely and in accordance with the schedule and rules of the local track while the blockade is in effect.