S1 tender--what is the box behind the coal bunker steps.

NW Mailing List nw-mailing-list at nwhs.org
Mon Apr 21 15:25:44 EDT 2014


There seems to be some sort of black box device with lines or wires going to it.
What could it be?  Loco 257 has a rear view photo that shows it.
Thanks
Mike Shockley
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