This one's for Gary S.

[doctorwayne]

The common visible feedwater heaters are the Elesco (from L. S. Co which was???) -- a big tube in front of the stack --and the Coffin -- stuck out in front and bent around above the smokebox door. Of course, all of these had incomprehensible piping hooked into them. And then there were interior ones which we don't need to know about (except where the piping is visible),

Locomotive Superheater Co., I think.

Elesco heater bundles were often ahead of the stack or on brackets at the front of the smokebox, but could also be behind the stack or on the pilot deck. Coffin feedwater heaters were usually hidden inside the smokebox, although a few roads did have exposed versions. Also common were various versions of the Worthington BL, a massive combined pump and heater usually hung on the fireman's side of the loco, above the drivers. These were eventually superseded by the Worthington SA.

There are some examples of these shown HERE.

Wayne