A year or so ago, there was an accident near Sydney in which, due to a signalling problem a commuter train crashed into the rear of the Indian Pacific transcontinental tourist train. Several people were killed because the rear car of the Indian Pacific was a vehicle-carrying wagon for the tourists’ private cars. Its upper deck sliced the commuter train’s front car open for about twenty feet or so.
After rounding a bend, seeing the stopped tourist train in front of him, and realising there was no time to stop, the driver of the commuter train ran from his cab (taking his hands off the controls instantly applies a “dead man’s handle” emergency brake) and into the passenger compartment yelling for people to “get back”. If he and the passengers had needed to fumble with seatbelt buckles, the death toll would likely have been considerably higher.