. Electric railway journal . Where large capacity equipments areinvolved, such as locomotives and mul-tiple-unit cars for terminal electrifica-tion on trunk lines, the flexible gearhas been used to soften or dampen thevibratory action of the gearing due tothe phenomenon mentioned and also toother causes. In city service this wouldbe too expensive, although there arecases of interurban service where itcould be used with advantage. The helical gear overcomes inherentgear vibration by eliminating the so-called stepping over action. The op-eration of this type of gear can best

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