Brick-Shop - Technic 4250465 Gear Rack 1 x 4 Light Gray (3743) Parts Light Gray Technic Turntable, large Type 1, complete AssemblyElectric Battery Box Train Power Functions Motor online Engine Motor Lego (7897)
BrickLink - Part 87761 : LEGO Technic, Gear Rack 1 x 7 with Axle and Pin Holes [Technic, Gear] - BrickLink Reference Catalog