Hi. I've got several locomotives that have been sitting in the attic for quite a few years (at least 5) which no longer seem to work or only judder along a couple of inches and stop. Is there any way of cleaning them or something that could help them run better, or is it more likely that I have a power problem (the power adapter has also been in the attic for years)? I have already thoroughly cleaned the track. I've looked all over the internet with no luck, so I was wondering if anyone on here could help. Thanks!