42.--Details of rails for electric track.]
Gauge.--For indoor and short tracks generally it is advisable to keep the
gauge narrow, so that sharp curves may be employed without causing undue
friction between rails and wheels. In the present instance we specify a
2-inch gauge, for which, as also for 1-1/2 and 1-1/4 inch, standard
rolling stock is supplied by the manufacturers.
Track Construction.--It is essential that the centre rail and at least
one of the wheel rails shall have all joints bonded together to give a
clear course to the electric current, and the centre rail must be insulated
to prevent leakage and short-circuiting. Where a track is laid down more or
less permanently, the bonding is most positively effected by means of
little fish-plates, screwed into the sides of the abutting rails; but in
the case of a track which must be capable of quick coupling-up and
uncoupling, some such arrangement as that shown in Fig. 42 is to be
recommended.
Fig. 42 (a) is a cross vertical section of the track; Fig. 42 (c) a
longitudinal view; while Fig. 42 (b) shows in plan a point of junction of
two lengths of rail.
Pages:
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98