Hitachi Rail’s DGTRACK digital Audio Frequency track circuit equipment was recently approved for use on a major passenger rail operator in North America. DGTRACK is an advanced audio-frequency-based track circuit used to continuously detect train presence within mainline track circuit blocks (except through interlocking) and transmit cab speed command signals to the train. The system's solution is part of Hitachi Rail’s FDC 3G wayside signaling platform, which offers train control functions in a modern, vital platform (SIL-4).