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A capacitor would not store enough energy to run your loco. The solar panels would need to charge your onboard battery. If left out all the time, you will need some kind of charge controller. <br />An idea that I had(might use it myself) is to have a stub end track with the solar panels mounted near the end. Say the roof of the engine house or a warehouse. Install contacts on the front pilot and on the sides of the stub end. Drive the loco onto the stub end till the contacts on the pilot contact the contacts on the stub end. If it wasn't such a pain to post pics here, I'd include a drawing or what I mean. <br />If you are willing to spend the money, modern solar panels will do a pretty good job of charging batteries. I lived on a sailboat for years where the only electrical power was generated by solar panels.
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