The top of the rails must project slightly
above the chairs, so that the current collector may not be fouled.
Junctions.--At these points one 3/4-inch sleeper is reduced to 1/2-inch
width, and the other increased to 1 inch, this sleeper being overlapped 3/8
inch by the rails of the other section. To the outsides of the wheel rails
are soldered the little angle plates, AA, BB, attached to the sleepers by
brass tacks, which project sufficiently to take the brass wire hooks. These
hooks must be of the right length to pull upon the tacks in AA and make a
good contact. The centre rails are bonded by two strips of springy brass,
riveted to one section, and forced apart at their free end by the
interposed strip. Two pins projecting from the narrower sleeper fit into
holes in the wider to keep the sections in line at a junction.
General.--The sleepers of straight sections are screwed down to 3/4 by
1/4 inch longitudinals, which help to keep the track straight and prevent
the sleepers slipping. Sections should be of the same length and be
interchangeable. Make straight sections of the greatest convenient length,
to reduce the number of junctions.
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