TMCC utilizes the same command codes as Digital Command Control (DCC). However, unlike DCC, it uses a 455 kHz radio transmission to carry the command codes separate from track power. The locomotive decoders are dependent on AC track power (50 or 60 Hz) to synchronize the command receiver. Thus, TMCC can only operate on AC track power. Because TMCC utilizes the DCC command codes, it is possible to control TMCC with DCC compatible software. MTH Electric Trains included support to interface and control TMCC with its DCS system. Unlike DCC, TMCC-equipped locomotives can run simultaneously with non-TMCC locomotives. Lionel ceased the sale of TMCC command systems in 2010, but continues to introduce models equipped with TMCC decoders. TMCC has been superseded by Lionel's Legacy command system.digitdynam.com
