. Railroad structures and estimates . and- be re-elevated when necessary. This structure is a modification of the McHenry type of coalingplant, and consists of two double elevated coal pockets, locatedbetween three tracks and connected together on top by a housespanning two tracks; the bottom hopper, into which the coal isdumped, is located behind the main pocket on one side, and is ele-vated 6 feet 6 inches above the locomotive service track, and madewide enough to take side-dump as well as center-dump cars. The elevating mechanism consists of endless chain and bucketsand a steel boot. From t
. Railroad structures and estimates . and- be re-elevated when necessary. This structure is a modification of the McHenry type of coalingplant, and consists of two double elevated coal pockets, locatedbetween three tracks and connected together on top by a housespanning two tracks; the bottom hopper, into which the coal isdumped, is located behind the main pocket on one side, and is ele-vated 6 feet 6 inches above the locomotive service track, and madewide enough to take side-dump as well as center-dump cars. The elevating mechanism consists of endless chain and bucketsand a steel boot. From the bottom of the hopper the chain is car-ried up and over the house across the tracks, returning under thefloor, and back to the boot. The drive is run by electric motorcontrolled by a switch on the ground near the coal dump hopperfor 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 endless 148 RAILROAD STRUCTURES AND Fig. 68. Three-Track Coaling Plant. COALING STATIONS. 149 buckets and hoisted up to the elevated pockets above and along thehorizontal trough over the track. Openings with slide doors andchutes are arranged to supply any pocket with coal when chain speed is 65 feet per minute and the power consumptionabout 20 horsepower. Sand Tower. — With the foregoing arrangement three tracksare provided for coaling locomotives, and the space between theelevated pockets facing the track may be used as a sand tower, soarranged that sand can be furnished on two tracks, the sand beingelevated by air pressure from a cylinder in the drying room throughinclined pipes, the sand house being located between the twotracks about 50 feet ahead of the structure. The cost of the woodsand house lined with galvanized iron on the outside, includingsand bins between coal pockets and all mechanism, averages from$1200 to $1500. Balanced Bucket or Holman Type. (Fig. 69.
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