Re: Mechanical difference between K-37 and K-36 question

Not NG, but a few photos of PFI 92 to illustrate some points that have been mentioned. The first photo shows the damper counterbalance which is on the engineers side of the smokebox. 2nd photo shows the Superheater patent plate. The 3rd photo is of a valve system that dumped the air compressor exhaust steam into the engine cylinders while drifting. Both the damper operating cylinder and the drifting valve operating cylinder were connected to a steam line that was tapped off of one of the cylinder steam supply lines running back from the smokebox to the cylinders if I recall. Once pressure had begin to build in the steam lines to the cylinders after the throttle was opened, steam pressure would actuate both the damper cylinder and the drifting valve cylinder. I wonder if this was just a geared engine thing as far as using the compressor exhaust to supply steam to the cylinders when drifting or did any rod engines have this?