The Aster schools has a  dead leg lubricator between the frames at the front of the 
loco.  Any moisture or water 
in a system be it an air line or steam line will always go to the lowest spots, and 
the oil, being lighter than water, 
will rise to the top. This is a great example of two liquids flowing in opposite 
directions in the same tube. 



GaryB 

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