. Railroad structures and estimates . Engine Track Fig. 226. power is placed a little beyond the coal structure, and a ropedrive connects the engine with the main drive above. If de-sired, the mechanism can be motor driven direct or by pulley,thus dispensing with the engine house, when electric power canbe obtained. The chain speed is 65 ft. per minute and the powerconsumption about 12 to 15 horsepower. The space under thepockets may be boarded and used for storage purposes. Four-Pocket, Three-track Plant, Wood Structure. — Fig. 227illustrates a four-pocket, 150-ton elevated capacity, three-tr
. Railroad structures and estimates . Engine Track Fig. 226. power is placed a little beyond the coal structure, and a ropedrive connects the engine with the main drive above. If de-sired, the mechanism can be motor driven direct or by pulley,thus dispensing with the engine house, when electric power canbe obtained. The chain speed is 65 ft. per minute and the powerconsumption about 12 to 15 horsepower. The space under thepockets may be boarded and used for storage purposes. Four-Pocket, Three-track Plant, Wood Structure. — Fig. 227illustrates a four-pocket, 150-ton elevated capacity, three-trackcoaling plant. Cost complete $12,000 to $16,000 with dynamom-eter weighing device to each pocket, so that the amount of coaltaken by each tender is recorded. Under the elevated pocketsnext to the coal hopper the space is boarded and used for storagepurposes if desired, gates being provided so that the coal canflow back into the hopper and be re-elevated when necessary. 480 MECHANICAL Fig. 227. Three-track coaling plant. MECHANICAL PLANTS. 481 This structure is a modification of the McHenry type of coal-ing plant, and consists of two double elevated coal pockets,located between three tracks and connected together on top bya house spanning tw^o tracks; the bottom hopper, into whichthe coal is dumped, is located behind the main pocket on oneside, and is elevated 6 ft. 6 in. above the locomotive service track,and made wide enough to take side-dump as well as center-dump cars. The elevating mechanism consists of endless chain and buck-ets and a steel boot. From the bottom of the hopper the chainis carried up and over the house across the tracks, returningunder the floor, and back to the boot. The drive is run byelectric motor controlled by a switch on the ground near the coaldump hopper for the convenient use of the operator. When the coal is dumped into the hopper it flows by gravityinto the boot, regulated by a gate, and is picked up by the end-less buckets and hoist
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