Telescoping (rail cars)

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Cars of the Washington Metro were telescoped in this November 3, 2004 accident at Woodley Park station. NTSB-Woodley-Park-Accident.png
Cars of the Washington Metro were telescoped in this November 3, 2004 accident at Woodley Park station.
Interior of Washington Metro car 1077 following telescoping in a head-on collision. This car sustained a loss of 34 linear feet of passenger compartment space (nearly half the car) due to telescoping. WMATA Rohr 1077 interior following telescoping following Woodley Park-Zoo collision.png
Interior of Washington Metro car 1077 following telescoping in a head-on collision. This car sustained a loss of 34 linear feet of passenger compartment space (nearly half the car) due to telescoping.

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 collapsible telescope – the body sides, roof and underframe of the latter vehicle being forced apart from each other. [1]

Contents

Telescoping often results in heavy fatalities if the cars telescoped are fully occupied. The car riding on top will often be destroyed by the structure of the car below, crushing those on board (although the physics of the incident may reverse the cars' roles). The chances of telescoping can be reduced by use of anticlimbers and other structural systems which direct crash energy and debris away from the passenger and crew areas. [2] One such energy absorbing system is the Green Buffer, winners of the 2023 Swedish Steel Prize, [3] where a collapsing steel structure in the buffers dissipate energy similarly to the crumple zones used in the automotive industry.

Accidents where telescoping occurred are numerous and include:

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.

See also

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References

  1. ↑ Solomon, Brian (2001). The Heritage of North American Steam Railroads. London: Amber Books. p. 101. ISBN   1-897884-75-3.
  2. ↑ Tyrell, David and Jeff Gordon (June 2013). "Crash Energy Management An Overview of Federal Railroad Administration Research" (PDF). onlinepubs.trb.org/. TR News. Retrieved December 14, 2022.
  3. ↑ "Green Buffers wins Swedish Steel Prize 2023". Steelprize.com. Retrieved 24 May 2023.
  4. ↑ Einat Rozenwasser (25 February 2012). "Un operativo que resultó eficaz pero que ahora revela fallas". Clarín (in Spanish). Retrieved 25 February 2012.
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