I could not find the O-gauge track clip that allows you to interface with the transformer, so I got some copper wire soldered on there. I later secured the leads with another zip tie down to the black plastic base and then wrapped the wire tabs with electrical tape. The wire tabs I made sure to face the male and female tabs in opposite directions for live and ground wires. The copper wire I threaded through some small holes I drilled into the track with a hand drill. This allowed me to get two or three solder spots for the wire on the track.