NCE 524-226 (524-0226) Program Track Auto Switch For The Power Cab

NCE
The Auto-SW is a smart relay board with one input (two wires from powercab output) and two outputs. One output for the main layout and a second output for a programming track.It senses when you put the PC into program track mode and energizes a relay that disconnects layout track power and connects a dedicated program track.  
It is designed to detect packets on the DCC track bus that initialize service mode programming aka- programming track mode. When it sees those packets it throws a relay disabling one set of outputs and activating the other.
It will operate with other DCC systems such as the Digitrax Empire Builder, Big Boy, or Challenger.
It does not operate when using PROGRAM ON MAIN.
It is designed to be used with the Powercab in the original starter set configuration only.