Final answer:
If a vehicle stalls on railroad tracks, passengers should immediately exit and if safe to do so, push the vehicle off the tracks. Emergency flashers should be on, and one should avoid setting the parking brake. Understanding atmospheric pressure explains why it's dangerous near moving trains.
Step-by-step explanation:
If your vehicle stalls on railroad tracks and cannot be restarted immediately, the first action you should take is to get any passengers out of the vehicle. Once everyone is safe, attempt to shift to NEUTRAL and push the vehicle off the tracks if a train is not visible or immediately approaching. If there is an immediate danger of a train approaching, move away from the tracks in the direction from which the train is coming to avoid being hit by debris if the train hits your vehicle. Additionally, turning on the emergency flashers can help alert others to the danger, and setting the parking brake is unnecessary and counterproductive since you'll be trying to move the vehicle.
As related to the concept of atmospheric pressure and the danger near railroad tracks, when a rapidly moving train passes, it displaces the air around it, creating a difference in air pressure. This can cause a force that might push you toward the train due to the lowered pressure in the wake of the train compared to the higher pressure behind you.