Willamettes

Shays

Slide

Piston

• Outward facing valve chests
  

• Rear-most chest\cylinder positioned forward of cab
  

• Chests\cylinder frames identical in construction
  
  

• Valve chests parallel to boiler. Front two facing forward. Rear-most facing toward cab.

• Rear-most chest\cylinder partially behind front edge of cab on all but some Pacific Coast models.

• Chest\cylinder frame construction different on at least one.