Background
The R179 contract, which originally consisted of 420 cars, was intended to replace all of the R44s. Due to structural integrity issues found on the New York City Transit R44 fleet in early 2010, its retirement was facilitated by option order cars of the R160s. The Metropolitan Transportation Authority later dropped the plan to order R179s for the Staten Island Railway, instead opting to overhaul some R46s to replace the existing R44s there.
Read more about this topic: R179 (New York City Subway Car)
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