3 Rail Track Power Block

This thing is a power block that provides a plug-in receptacle for a Lionel DC power supply.

I purchased some 3-rail track but did not have any power connector sections or clamps. So I soldered some wires (18 awg) to the three rails and then soldered the ends to a 2.5mm power connector. The Lionel power supply uses the 2.5mm power plug. This thing hides/protects the wiring and, makes the connection to the track look nice and neat.
You can see that it is also plugged into the switch that I made and can be found here on Thingiverse.