Background
The R142A cars were built by Kawasaki from 1999 through 2004, and have many of the same features as the R142, built by Bombardier. The 400 R142A cars of the main order are numbered 7211-7610; the 120 option cars are numbers 7611-7730. Eighty cars, known as the R142S, were built by Kawasaki in 2003-04 to supplement the R142As. They are numbered as 7731-7810. Note that R142S is not an official designation, just a reference to the Supplemental order of these cars. They are mechanically and physically identical to all other R142As, and therefore it is customary to refer to cars 7731-7810 as R142As.
As of 2012, cars 7221-7590 and 7596-7670 run on the 6 train and cars 7671-7810 run on the 4 train.
Cars 7211-7220 have been overhauled with Communications-based train control (CBTC) and are now R188s. As of February 7, 2012, cars 7591-7595 have been taken out of service and are currently at Corona Yard. It is unclear whether this set will be overhauled into R188s.
Approximately 380 R142A's are expected to be overhauled into R188's for Flushing Line CBTC Service, more than half of the R142A fleet.
Read more about this topic: R142A (New York City Subway Car)
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