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R42 (New York City Subway car)
The R42 is a New York City Subway car model built between 1969 and 1970 by the St. Louis Car Company in St. Louis, Missouri, serving the B Division (IND/BMT). This fleet was the first to be fully equipped with Stone Safety 10 ton air conditioning systems/units similarly found on the last ten (10) R38 and R40A cars. The R42 fleet is numbered 4550-4949. It was the last B Division car built for the New York City Subway until the R143 in 2001, and the last car model class to be built in married pairs.
==Background==
On May 9, 1969, cars 4554-4555 entered service on the as part of a mixed consist with R40Ms. Although, there were some slight cosmetic differences, the R40Ms and R42s were for all practical purposes the same car type. As of January 5, 1970, all cars were in service.〔 ERA New York Division Bulletin, August 2005 "January 5, 1970 Car Assigment", Page 9. () 〕
The R42s were the first cars to use solid state converters in place of the motor-generators as standard equipment.
In 1974 twenty R42 cars 4650-4659 & 4760-4769 were sent to Garrett AiResearch's facilities in Los Angeles, California to have an Flywheel Energy Storage System equipment, and Energy Conservation machinery with batteries installed under each of the even numbered cars, while the odd numbered car's remains untouched. These cars were later tested at the UMTA, and US Department of Transportation's Testing Facilities in Pueblo, Colorado for evaluation before returning to the MTA-NYCTA in 1976 for in-service testing on all BMT/IND Lines to check-out its effectiveness. The even numbered cars had a amber-type digital readout indicating the amount of energy used on the even numbered cars with the Energy Conservation equipment installed, verses the odd numbered cars which did not receive the Energy conservation equipment.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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