. Electric railway journal . ecause the invading bodyhaving penetrated between the side walls, exerts a burst-ing stress on the invaded structure. The memberscomposing the roof are always light in section and thejoints connecting them to the side walls equally in-adequate to resist the heavy tension stress of collision. 5. The structure of the invading car is subjected tocompression, and as the joints connecting its membersare better able to resist compression than the invadedcar structure is to resist tension, the invading car bodyis seldom seriously damaged. Accurate computation of the force
. Electric railway journal . ecause the invading bodyhaving penetrated between the side walls, exerts a burst-ing stress on the invaded structure. The memberscomposing the roof are always light in section and thejoints connecting them to the side walls equally in-adequate to resist the heavy tension stress of collision. 5. The structure of the invading car is subjected tocompression, and as the joints connecting its membersare better able to resist compression than the invadedcar structure is to resist tension, the invading car bodyis seldom seriously damaged. Accurate computation of the forces expended in acollision between trains is practically impossible. Tworeactions, however, occur in all rear-end collisions, whichcan be used roughly to gage the violence of the shock,namely: (1) Depth of penetration by the invadingcar, and (2) the distance the standing train is drivenahead by the force of the collision. With these reactions in mind it seems highly desirablethat the invading car be restrained from penetration.
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