No, the R142A seen in Pelham 123 was a mock-up R62A that looked like an R142A. Yes it looked exactly alike an R142A but only a mock-up. As I remember, I do think an R142A test train was used for the movie back in 08-09 ONLY for the Pelham movie as the scene where Denzel Washington was on the the train was near 61 St-Woodside and it was in fact an R142A. At the time, R142A's were being testes on the Flushing Line, before R188's existed.
This is fishy, theres 2 R62's on the Lexington probably being theres a planned loan to the from the OR maybe just a yard move bound for 180th or Westchester.