Mistake adds another delay to LIRR PTC installation

Problems are still plaguing the Long Island Rail Road's effort to install a system that can slow or stop a train in an emergency.

Positive train control, or PTC, is a federally mandated electronic crash prevention system that is set to be installed on all LIRR trains. It automatically slows down or stops a train that goes too fast or violates a signal.

During a committee meeting Monday, a Metropolitan Transportation Authority contractor said a mistake was discovered in how PTC was being installed on train cars, which is now delaying the project even more.

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