Engineering the CBTC interface with the NYCT R143 vehicle

New York City Transit has embarked upon an extensive modernization program. Transit cars will employ AC drives and multiple microprocessor controlled systems instead of contactors, resistors, and relays. A new technology signal system based on communications based train control (CBTC) technology is also being introduced for long term deployment over the complete subway system. Microprocessors will replace traditional track circuits and wayside color light signals and tripstops. Signal equipment will now be installed onboard the cars, responsibility for the signal system will now be spread between two NYCT Divisions. In December 1998, New York City Transit signed a contract with Kawasaki Rail Car Inc. for R143 B Division transit cars. The contract was fast track with the first eight cars delivered in early 2001. Provisions were made for space, cables and wiring, and system functions to make the cars CBTC ready. The cars will enter passenger service for a period before the CBTC equipment is delivered, and the latter is intended to be "plugged-in" to the R143s as simply as possible. The CBTC/R143 integration process was complex and initially a common set of interfaces was developed with three short-listed proposers' systems. Upon award of the CBTC contract in December 1999, the interface was consolidated and finalized. The concept of developing detailed mechanical, electrical, and functional interfaces prior to the completion of the preliminary design of the CBTC was a challenge at best. Coupled with the tight R143 delivery schedule, there was pressure to make detailed engineering decisions at a very early stage of CBTC system design.