A collision between two commuter trains in Chicago occurred during the cloudy morning rush hour on October 30, 1972, and was the worst such crash in Chicago's history. Illinois Central Gulf Train 416,
NTSB photograph of the crash site
Telescoping (rail cars)
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In a railway accident, telescoping occurs when the underframe of one vehicle overrides that of another, and smashes through the second vehicle's body. The term is derived from the resulting appearance
1972 Chicago commuter rail crash
…of the express train did not see the bilevel train backing up until it was too late. When the trains collided, the front car of the express train telescoped the rear car of the bilevel train, killing 45 people and injuring 332. The death toll could have been higher, but the accident occurred near Michael…
The aftermath of the June 2009 Washington Metro train collision
The aftermath of the 1898 St Johns rail accident, where the rear two carriages of a passenger train were telescoped by being hit at 8 mph (13 km/h) by a following train.
Cars involved in the Mud Run disaster, October 10, 1888