Office of Railroad, Pipeline & Hazardous Materials Investigations Survival Factors Crashworthiness.

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Presentation transcript:

Office of Railroad, Pipeline & Hazardous Materials Investigations Survival Factors Crashworthiness

Crashworthiness Issues Carbody telescoping. Minimum crashworthiness standards for transit railcars.

Vehicle Dynamics Train non-revenue - 6 railcars / 1000 series % grade - > 2,200 ft - estimated 36 mph

Vehicle Dynamics Train revenue - 6 railcars / 4000 series - train operator and about 70 passengers - stopped / servicing platform - train operator escaped / warned passengers

Vehicle Dynamics Collision - Train 703 / last railcar - Train 105 / first railcar longitudinal override about 20 ft loss of about 34 linear feet of occupant survival space (almost half the length of passenger compartment)

Vehicle Dynamics Train 703 / last railcar - collision posts survived essentially intact - carbody underframe structure adjacent to collision posts failed Train 105 / first railcar - carbody structure withstood collision

Carbody Telescoping Woodley Park collision – November 2004 / Car 1077 interior

Carbody Telescoping Woodley Park collision – November 2004

Carbody Telescoping

Technical Specs Review Structural features / collision protection provisions Carbody design versions: - Rohr 1000 series - Breda 2000, 3000, CAF ALSTOM6000

Technical Specs Review Structural features / collision protection provisions Carbody design versions: resiliency: - Rohr 1000 series least - Breda 2000, 3000, 4000 higher - CAF 5000 next higher - ALSTOM6000 highest

Carbody Telescoping Metrorail has made progress… in the ability of a carbody end-structure to resist catastrophic telescoping. Recommendation R-96-37: Closed - Acceptable Action in May 2002.

1000 Series / Rohr Railcars Least relative degree of carbody end-structure resiliency About 31 % of fleet Targeted retirement in 2012

Conclusion The failure of the carbody (underframe) end structure of the 1000-series Metrorail cars may make them susceptible to telescoping and potentially subject to a catastrophic compromise of the occupant survival space.

Minimum Crashworthiness Standards for Transit Railcars FRA: crashworthiness standards for railroad / commuter passenger railcars. FTA: regulatory authority over transit operations, but no railcar crashworthiness provisions.

Minimum Crashworthiness Standards for Transit Railcars Individual transit system operators: - prescribe own crashworthiness specifications - use specialized technical contractors No minimum structural crashworthiness standards for transit railcar equipment

Conclusion The failure to have minimum crashworthiness standards for preventing telescoping of rail transit cars in collisions places an unnecessary risk on passengers and crew.