The file 'Toy Train For Legos Larger Wheel 3D Printer Model' is (stl) file type, size is 12.8KB.
I found the wheels on the original Toy Train for Legos (http://www.thingiverse.com/thing:11671) by sconine to be too small (honestly I think this version is a little small as well, but I find it more adequate for the wooden track uphill pieces.
toy_train_wheels_wood_track_mod.stl | 59.8KB |