The upgrade is very easy and straightforward. The LED strip comes on a roll sold on Amazon. The LED strip can be cut to any length needed at the cut marks. The strips have Solder points at each cut mark. I removed all the Lionel light bulbs and solder two wires to one of the lamp sockets. I keep polarity with the track hot as positive and the negative as body ground. The two wires that come direct from the pickup rollers each get a 330 ohm resistor, this protects the LED’s that are rated at 12V. The body ground wire has a 150 ohm place on it.
very simple and the strip lighting is great.
these are the strips on Amazon: