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New Technology Train (NTT) is the collective term for the modern passenger fleet of the New York City Subway that has entered service since the turn of the 21st century. This includes the current R142, R142A, R143, R160, R179, and R188 models and the planned R211 and R262 models. Two prototypes, the R110A and R110B, were used to test the features that would be found on all NTT trains today.
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