Toy Building Blocks; namely, hardwood building block sets containing wooden pieces shaped as arches, circles, pillars (cylinders), squares (cubes), rectangular shapes, spires (pyramidal shaped), curves, roofs (triangular solid), wedges and other basic geometric solids specifically dimensioned to fit on, under, over and around wooden toy railroad systems and sized to be assembled as buildings, bridges, archways, overpasses, tunnels, and other architectural renderings.