. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . ruck is similar to the standard truckwhich is in universal use on steam railroad passenger cars in theUnited States. Different truck builders have introduced manv varia-tions in this general type of truck, in adapting it to electric modifications from the steam railroad standard truck werenecessary to accommodate the electric motors and to permit in somecases a low-hung car bodv. Such trucks are made in
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . ruck is similar to the standard truckwhich is in universal use on steam railroad passenger cars in theUnited States. Different truck builders have introduced manv varia-tions in this general type of truck, in adapting it to electric modifications from the steam railroad standard truck werenecessary to accommodate the electric motors and to permit in somecases a low-hung car bodv. Such trucks are made in a great varietvof sizes. Fio;. 44 .shows one of these trucks built bv the St. Louis CarCompany. Tn this type of truck the car body is fastened to thetruck only by the kingi^olt on which the truck swivels. This kingbolt \ is placed in the center of the truck ])olster. There are also sidebearings between the car body and the ends of the bolster, to preventti])ping of the car body when it is unbalanced. The arrangementof this part of the truck is shown in Fig. 45. Under this areelliptic springs which rest on what is called the sprinc/ plank: This ELECTRIC RAILWAYS 49. Fit;, u. St. Louis Car Company Truck. spring plank Imngfrom tlie roctan«^nliirframe of tlio truck whicli allow aaide motion. Thisside motion pves riding, )eciallyupon entering andleaving curves. Alltru(dvs having thisfeature are known assu-dkj holster weight, beingtransmitted to thetransom and tru(d<.frame through theswinging links justreferred to, is tlientaken by the ecjualizersprings that supportthe rectangular truckframe on erjualizingbars, which ecjualizingbars rest on the jour-nal box at either endand are bent downto accommodate theui^rings located be-tween them and thetruck frame. Jhetruck frame holds thejournal boxes in align-ment by means otguides which permit anup-and-down move-ment without move-ment in anv other di- 50 ELECTRIC RAILWAYS rectioii. just as
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