FreeThomas The Train
Printables
10 model
Free
FreeBritish Rail Y7 Steam Train Locomotive 3D Printable
Printables
FreeHeart shaped and steam engine shaped hooks / hangers
Printables
FreeSteam Engine
Thingiverse
FreeSteam Engine with Rails - 3D Model (.OBJ + .MTL)
Sketchfab
FreeSingle Cylinder Oscillating Steam Engine
Thingiverse
FreeCompact Working Oscillating Air/Steam Engine (fully printable)
Thingiverse
FreeOscillating Cylinder Motor for LEGO (3d Print)
Sketchfab
Free3d Printable Pneumatic-Engined Toy Car
Sketchfab
Free3d Printable Air Balloon Engine for LEGO
Sketchfab