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I have a DC lionel steam locomotive from 1989. It was my late grandmother's so I enjoy running it, even though its DC. I have an O27 line specifically for it with two switches and soon to be two uncoupling tracks. I am aware that I can convert the loco to AC but for now I choose to just keep it DC. (If it aint broke, don't fix it). Anyways, the switches I have are the brown plastic ones. I want to wire them for constant voltage. Well I watched a Lionel video showing how to do this for AC, so I tried the same procedure for DC. I tried to phase two identical DC transformers by hooking the grounds together. Then one transformer positive to the track, the other transformer positive to middle wire inside the switch. The train would run as usual but the switch would not budge. Well I fiddled with the wires and ultimately went back to one transformer, hooked the positive to the switch, and now it won't work at all. I think I must have ruined something. I cannot get the switch to move under any circumstance. I can order a new switch, so its not the end of the world. I would like to know however, when I get the new switch, what would be the correct way to apply constant voltage to this switch? If it helps, I have two lionel 4660 power packs. They each put out 0-17 volts DC, or a constant 20 volts AC for accessories. Please remember that I am a beginner when it comes to this stuff, so big electrical lingo or complicated schematics won't help me a whole lot. Also, I plan on ordering lionel 65149 uncouplers and I would like to wire them for constant voltage as well. Thanks for any advice or help.    

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Well here is an update to what I have learned. The 4660 transformer does have enough power to run switches and use an uncoupler. I have successfully wired the uncouplers for fixed voltage using two 4660 transformers that are phased. It was surprisingly easy and works great. The switches on the other hand are still giving me problems. The switches worked fine when used conventionally. Sometimes I had to increase the speed of the train a little to get them to move, but they did. Now I have tried wiring both brown O27 switches for fixed power, just like the lionel video shows. I cannot get either switch to work at all under any circumstance. I have even tried to wire the switches back to original, and they still will not work. I seem to have ruined them somehow. I have even tried them on an AC transformer, and they will not work. For the life of me, I don't understand what went wrong, and why they won't work. Anyways, any help would be appreciated. Also, can anyone recommend a different type or brand of O27 switch that will work with fixed DC voltage? Thanks      

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