OR.......consider a Piko battery R/C turnkey ready to run upgrade to your Lionel engine for about the cost of a Z-4000 by Robert Buck 717.309.0706 in York, PA just around the corner from the York Fairgrounds. Robert has handled 0 gauge conversions for a lot of us. His work is professional and he is attentive to custom details. He is also a multi discipline talented craftsman. You will enjoy working with him.
You will not need any wires from track to a power supply and the engine will perform smoothly without any concern as to how far the loco may be from a track/buss power feed.
My only thought is that I should have done this years ago.