The smokebox With Bridget both the steam supply and (obviously) the steam exhaust pass through the smokebox so it is necessary to get the smokebox in the right position before the appropriate steam plumbing can be put in place. The steam supply will come from the superheater tubes into the steam column, a vertical gunmetal manifold that passes through the bottom on the smokebox and then out to the cylinder steam chests. The lubricator injects steam oil into the very bottom of this column so that it is carried into the cylinders. This is a reasonably straightforward machining job with some copper pipe work. The supply pipes have to bend through a pretty sharp right angle as they go over the frames and on to the top of the cylinder. I found this pretty hard to do well and, in the end, made a deep groove in a piece of round bar and worked it round as best I could with lots of annealing.
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