You don't specifiy which type of trains you are using, but be aware that only the wood track will work with wooden trains.
The quality of many of the other compatible wooden track brands varies. Be aware that while they are somewhat compatible, often the cheaper track will get "stuck" and break off in the authentic track because they are sometimes a little "off" in their design.
The best way to tell if you're getting authentic Learning Curve wooden track is by looking at the markings on the wood. Authentic Thomas track has engraved horizontal grooves to make it look like actual train rails/tie rods. The other types (Brio regular track included) will be smooth with the exception of the verticle grooves for the train wheels.
Old school (pre-2002) Thomas track also comes in the Clickety-Clack version, and those have very deep horizontal lines in additions to the finer tie-rod grooves so that when the trains (especially the wooden versions that are battery operated) make a clickety clack sound like real trains rolling down the track.
Authentic Thomas track also comes in a version called "Wacky Track" and it is wood pieces on a a flexible strand that allows it to manipulated in any direction...giving the child more options when building their set configurations.
All pre-2001 Thomas was made with real Vermont Wood. You can tell the difference when you line up old track next to the newer stuff.
H. these hints help.