"In the blink of an eye" or so the saying goes.
Trains move faster than most people realize, and in the blink of an eye the average train will have traveled 41 feet.
When you approach a railroad crossing, stop, listen and look because a train can come from either direction. Stay alert, distractions like headphones may prevent you from hearing an approaching train. If the crossing arms are down or the lights are flashing, assume a train is coming, even if you cannot see one. Never drive around crossing arms, and never stop on railroad tracks. Remember, trains always have the right of way over cars, trucks, pedestrians, and even police cars, ambulances and fire trucks.
Don't be on the losing side of physics. The weight of a train compared to an automobile is similar to the weight of an automobile compared to a tin can. Drivers can steer out of the way of crossings, trains cannot.