Rail Oiler

[nw-mailing-list at nwhs.org]

As I was perusing my recently purchased copy of the NWHS "N&W Signal
Diagrams" book I found something I had never seen or even been aware of. 
It is found on pages 59 and following in the a fore mentioned book.  It
is a "rail oiler".  Can any one on the list fill me in on why they were
used and where.  It's obvious that it was to put oil on the railhead. 
I've always thought that oil and rails don't mix and make for a very
slippery time. 

Thanks ahead of time for any and all info.

Dave Moorehead
Milford, OH

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