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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 of the two vehicle bodies: the body of one vehicle may appear to be slid inside the other like the tubes of a telescope - the body sides, roof and underframe of the latter vehicle being forced apart from each other.
Accidents where telescoping occurred are numerous and include:
- The Illinois Central Gulf commuter rail crash in Chicago
- Seer Green rail crash
- Moorgate tube crash
- 2008 Chatsworth train collision
- 2009 Washington Metro accident
To reduce the chance of telescoping, rail and tramway vehicles are often provided with an anticlimber: a horizontally ridged plate at the end of the chassis, which in a collision will engage with the anticlimber on the next car.
External links
Illustrations at these external links:
- Being installed on a preserved streetcar
- On a preserved Tokyo subway car
- On a diesel locomotive (painted silver)
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