I thought I'd pass along a lesson I have learned the hard way. My layout is in my basement, which has fairly high humidity in the summer and is very dry during the heating season. Last February I noticed kinks developing in several areas and eventually realized that what was happening is this: The track had been laid in the summer, when the wood subroadbed was somewhat swollen due to humidity. As it dried out, the wood shrunk a little, bringing the track nails closer together, causing the kinks. The solution (or the one I used) was to pull the track nails, use a cut off disc in a Dremel to remove some rail (in some cases, the width of the disc was sufficient, others were as much as 1/8")and solder new leads as required. Luckily, I had not yet ballasted. Track which I laid in the winter has given me no problem. By the way, I had painted the roadbed and subroadbed with latex paint prior to laying track, thinking it would prevent a problem like this, it didn't. Hope this saves someone some aggravation.
Regards, Gary
Regards, Gary