12 pcs. These set expansion packs are great assortments for beginning to experienced engineers. Each pack comes with a free Builder's Guide filled with exciting new layouts to expand your favorite Thomas Wooden Railway set. Works well with the Oval Set, Water Tower Figure 8 Set, Conductor's Figure 8 Set, Circus Set, Down By the Docks Set and Around the Barrel Loader Set.

Thomas Wooden Railway collection:
-Magnetic couplers
-Also compatible with BRIO wooden railway system
-Thomas the Tank Engine Trains.
-by Learning Curve