The remote you are showing is to run the Z4000 transformer remotely, and not the MTH DCS engines per se. You can remotely run up to 3 Z4000s with the remote as long as you have 3 receivers. So you can run up to 6 tracks with this remote up to 30 feet away from the transformer/s. It was designed for conventional operation back in the late 90s and is usually hard to come by.
As far as I know it does work well for what it was designed for.
