As others have stated, the Sensor track must be installed in the LCS system and programmed per the instructions. Once that is done using the Sensor track to upload the engine data is really simple, I do it all the time, that means I am buying too many new Legacy engines.
All Legacy engines are delivered with the I.D. Set to #1. Slide the program switch from Run to Program, make sure there track power is on, enter its new number then push set. Slide the switch to Run. Using the Cab2, run the engine over the Sensor Track and all the data will be entered into the Base. Every Legacy engine I have purchased with the IR transmitter knows it is a Legacy engine when it is first started with a Legacy signal on the track.
If it is an older Legacy engine (prior to about 2012) or a TMCC engine it will not work with the Sensor track.
If you are building an LCS installation it is a good idea to keep a record of how each device is programmed in case one fails. I have had that happen. Here is page 1 of my list. It shows the Sensor track in Line 1 has TMCC ID of 81.
