Unknown device atop steam loco smokebox

[doctorwayne]

Thanks for that lead, Crandell.  I googled "Press release for new Texas & Pacific 2-10-4 locos" and came up with this:

Full text of railway and locomotive engineering:  a practical journal of railway motive power and rolling stock

 

You'll need to scroll down past the 4-6-0/2-10-2 discussion, beyond the crown sheet failures and piston and trailing truck innovations to a section entitled

"A New Locomotive for the Texas & Pacific 

An Interesting Development of the Lima Locomotive Works"

 

Here's an excerpt from that lengthy discussion, which, based on your expert's suggestions, may be the answer to the original question:

The cylinders and steam chests are lubricated by a four- 
feed Nathan force feed lubricator and by two of the feeds 
from a five- feed hydrostatic lubricator' connected to the 
steam idjK's. The other three feeds from the hydrostatic 
lubricator take care of the air pump, the feedwater pump 
and the booster. In addition to these a National Graphite 
Company pendulum type graphite lubricator is fitted to 
deliver into the neck of the superheater header where 
the saturated steam enters. 



Wayne

[selector]

Good for you, Wayne.  I think you may be on to something.

Crandell

[BigJim]

Nice job Wayne!