I have a son that is on the autism spectrum and doesn't have a lot of patience to deal with derailments.  He is a huge fan of Thomas and we recently purchased an HO set with EZ track.
At least three of the track reconnection are somewhat uneven and cause a derailment.  You can't even make it around once without at least one car derailing.  We have the track on a solid, even flat board.  The cars don't seem to be heavy enough to stay on the track with Just the least amount of unevenness.  I've done my best to make sure the connections are tight and even, but still can't manage to get them all smooth.  For the price of the set and the additional trains we purchased, I hate to see this just sit in a closet unused.

Any suggestions would help.  Maybe switching over to the steel track and ditching the EZ track?  Thanks