. Electric railway journal . set it in motion. The essence of this problem is the element of time,and the structure best adopted to solve the problem mustcontain members which will act to resist penetrationat the vestibule end and interpose a rapidly increasingresistance to the progress of the invading car. The essential characteristics of a member best suitedto accomplish the above ends are: (1) Flexibility toavoid shearing; (2) elasticity to avoid abrupt stress-ing; (3) high ultimate strength in tension to resist thebursting stress exerted by an invading car. Manifestly the material best ada
. Electric railway journal . set it in motion. The essence of this problem is the element of time,and the structure best adopted to solve the problem mustcontain members which will act to resist penetrationat the vestibule end and interpose a rapidly increasingresistance to the progress of the invading car. The essential characteristics of a member best suitedto accomplish the above ends are: (1) Flexibility toavoid shearing; (2) elasticity to avoid abrupt stress-ing; (3) high ultimate strength in tension to resist thebursting stress exerted by an invading car. Manifestly the material best adapted to meet theabove requirements is wire cable. The manner of in-troducing the wire cable in a car structure may varyconsiderably. One form may be as follows: A wire cable anchored to the underframe of the carpassing through the vestibule buffer sill, up throughthe vestibule corner post, across the hood, down theopposite post, through buffer sill to anchorage point atunderframe. March 26, ly21 Electric Railway Journal 607. THE PENETRATION OF THE LOCOMOTIVE SELDOM EXTENDS THE DEPTH OF THE VESTIBULE. THE GREATEST DAMAGE OCCURS WHERE ONE CAR OVER-RIDES ANOTHER The loop is thus distended in such a manner that thevestibule end of an invading car will penetrate withinthe loop. The initial shock of collision will be met bythe vestibule end posts. When the resistance of these•end posts is overcome and as the invading body pro-gresses, the cable loop, together with the members ofthe invaded vestibule, will be drawn in and down againstthe vestibule of the invading body, crushing both withinthe confines of the loop. The more resistant the structures thus crushed, will be the energy absorbed and the greater willbe the pull exerted by the cable, through its anchoragein the underframe, to impait motion to the mass. The design further provides for a second group ofcables, imbedded in the body corner posts and bodyend frame, to act as a second line of defence against theinvadin
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