The engine is in the back of the train it is pushing. The passengers were in the car closest to the engine. There were five cars in total. The front car had one person in it. When he noticed a semi truck trailer sitting on the track he pulled the emergency brake and then jumped in to the car behind him. The train hit the truck and the front car was smashed together pretty badly but noone on any car got hurt. The train and truck stuck together after collision. Why didn't the passengers feel the collision?