The R188 is an A Division car for the New York City Subway. The MTA is planning to displace the R62As from the 7 train with these cars and to automate the IRT Flushing Line.
The R188 order originally consisted of 186 new cars, as well as 131 converted R142A cars compatible with communication-based train control (CBTC) and an additional 189 R142A conversion kits for MTA, totaling a possible 506 cars, or in other words, 46 eleven car trains. Given this number, it can be deduced that 230 of these cars will be arranged in 5 car sets while the remaining 276 cars will be arranged in 6 car sets.
According to the 2010-2014 capital plan, 146 new cars were to be purchased. Of these new cars, 110 cars would go to make up 10 new eleven car trains, while the remaining 36 cars were to be "C" cars that would go to expanding 36 CBTC upgraded R142A 5-car sets (360 existing cars) to 6 car length. The original planned total of 46 eleven car trains (506 cars) would still result from this order.
In the latest revision, however, only 103 new cars were to be purchased to form 8 new 11 car trains. Likewise, the number of conversion cars was altered to 370. This change was made with the knowledge that only two growth sets would be needed as opposed to the projected four sets, and thus, the MTA and Kawasaki opted to convert two additional R142A train sets in place of manufacturing two new sets. The MTA also decided to have Kawasaki perform all of the conversions at the Yonkers plant instead of 207th Street Shop as part of that contract modification.