Guys, It's been a very long time since I had and HO Scale model train, but I seem to remember having to sand or clean the tracks now and then, otherwise the train would loose contact with the track and stop moving. My wife and I are setting up a Christmas village, which will probably be up year round, we are planning a train which goes though a tunnel and passes though the village. The issue is that most likely the tunnel will be rather long and difficult to clean without taking the village apart. If the track is covered (by the tunnel) should I have issues with stopping trains? Also, I remember a kind of "Flex" track, it was brass I think and could be bent, would it maybe not corode as bad and/or stay cleaner longer?? Any suggestions would be great.