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Mike is correct - that is electrical conduit (EMT tubing) for wires coming from the generator to a junction box on the handrails.  The wires go through the handrails back to the cab.  Notice that there also is a section of smaller conduit from the marker light to another junction box on the handrail.  On PRR steam locomotives the headlight wires also route through a junction box on the handrail over the smokebox.  Absent scale dimensions, by comparing the relative size of the generator conduit in the photo to the handrails in the photo, and the relative size of the piece of wire you are considering using to the handrails on your model (typically oversized) you can decide what size wire best captures the look of the prototype on your model.

Ed Rappe

Larry, I did a similar conduit job sometime ago, on a Pennsy 4-6-0. I used #12 wire cleaned a strand, then fluxed it, then I wiped with some solder. This gave good rigidity, when I made my bends. I then painted them flat black, and super glued them into place. It looked like conduit to me!........

Several years ago I did some modeling in "G" gauge. I did several Aristocraft engines, I added many air/water/conduit lines. I used different sizes of plastruct plastic tubing. I would run different sizes of "Flourist Wire" thru the tubing, then I could bend the tubing to the shape/length that I wanted/needed, then pull the wire out and the tubing held its shape w/o kinking. I just don't think that you could find plastic piping that small, to where it would look like conduit on an "O" Gauge. 

Maybe worth looking into though, and if you can you won't have to worry about adding the element of heat/solder, to maintain rigidity to hold the shape!

Oh well just a thought, or as my youngest grandaughter says, "Just Sayin"!............................................Brandy! 

Last edited by Brandy

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