Strange as this may sound as the TE trackside unit is part of an RC system I keep it and my Crest 20amp power unit indoors and out of the sun in the kitchen on the sideboard. I crack the kitchen window open and feed out the output leads from the controller, that are spliced into a conventional 2 pin splittable garden cable connector that has its other end and cables attached to the rails. The TE’s trackside controller’s ariel is stretched out and held up by the handle on the window frame.
I also have my compressor indoors for my pneumatic switch and signal system in one of the kitchen units underneath. Its 1/16" ID flexible pipe is bound to the same cables with miniature cable ties and that also has a Q/R connector placed alongside the electrical one outside. All works fine and everything is protected indoors.
Just unhook the connectors when not in use, one end inside the other hanging down outside so water does not get in. The pneumatic pipe Q/R connector, left outside, has a plug put in to stop the ingress of any moisture