. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . n a wedge, ablock placed over the middle driving box, the backdriver run off the wedge and the middle driver runon a wedge, relieving the back spring. A block shouldthen be placed between the forward end of the backspring and the lower rail of the frame, and anotherblock placed on top of the back driving box toassist in elevating, eliminating the necessity of runningthe back driver on a high wedge. The middle drivershould then be run off the wedge, the back dri
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . n a wedge, ablock placed over the middle driving box, the backdriver run off the wedge and the middle driver runon a wedge, relieving the back spring. A block shouldthen be placed between the forward end of the backspring and the lower rail of the frame, and anotherblock placed on top of the back driving box toassist in elevating, eliminating the necessity of runningthe back driver on a high wedge. The middle drivershould then be run off the wedge, the back driver run ona wedge, blocking placed between the back end of themiddle spring and the lower rail of the frame, the blockremoved from the top of the middle driving box, theback driver run off the wedge, the middle driver run ona wedge, and the block removed from the top of the backdriving box (Plate 102). After running down the mid-dle driver the engine is ready to proceed. Back Spring. If the back spring is broken, themiddle driver should be run on a wedge, a blockplaced on top of the back driving box and under the BREAKDOWNS. 223. PLATE 102. frame, the middle driver run off the wedge and theback driver run on a wedge, which relieves the weightfrom the spring rigging. The back end of the backequalizer should then be chained up or a block placedin the safety hanger 2, or blocking placed betweenthe back end of the middle spring and the lower railof the frame at 3. Plate 103 shows the block on theback driving box with the wheel on a wedge and theequalizer chained; 2 shows where the block is placedwhen the engine is equipped with safety hanger; and 3shows where blocks are placed in case there is no chainor safety hanger. The back driver should then be runoff the wedge, and all loose parts removed to preventfurther damage.
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