. Electric railways, theoretically and practically treated . Fig. 161. —INDUSTRIAL NARROW-GAUGE LOCOMOTIVE. locomotive hitherto placed in service. The motors havea large current capacity, the design of all working partsis simple and accessible, and the depreciation and cost ofmaintenance should therefore be extremely small. Thelocomotives are provided with all the accessories of steamlocomotives, namely, air compressors for the brakes, whistle,bell, heaters, and pneumatic sanding device, all of whichare operated by electric power. Industrial Locomotives. — An industrial locomotive isusually de
. Electric railways, theoretically and practically treated . Fig. 161. —INDUSTRIAL NARROW-GAUGE LOCOMOTIVE. locomotive hitherto placed in service. The motors havea large current capacity, the design of all working partsis simple and accessible, and the depreciation and cost ofmaintenance should therefore be extremely small. Thelocomotives are provided with all the accessories of steamlocomotives, namely, air compressors for the brakes, whistle,bell, heaters, and pneumatic sanding device, all of whichare operated by electric power. Industrial Locomotives. — An industrial locomotive isusually designed to operate upon narrow-gauge tracks 262 ELECTRIC RAILWAYS, at very low speed and to exert a small draw-bar pull,which implies small dead weight. As a source of power,storage batteries are often employed, the dead weight ofthe batteries correspondingly decreasing the necessarynet weight of the truck to produce a given use of storage batteries as a source of power elim-. Fig. 162.—STORAGE-BATTERY LOCOMOTIVE. inates the overhead trolley with its accompanying sup-porting structure, which would be a serious objection inmachine shops. Consideration, must be taken of theobjectionable features of storage batteries, such as fumes, ELECTRIC LOCOMOTIVES. 263 moisture, heavy depreciation, necessary care, etc. and 162 represent two types of industrial storage-battery locomotives built by the C. W. Hunt Company.
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