. Electric railway journal . to ice that he hasa great deal of trouble with broken trucks. Thisis undoubtedly the result of the very rigid character oftrack while frozen, since he does not have this trouble•on days when the track is in normal condition. Another interesting feature of the mechanical tie isthat it seems to solve the difficulty of obtaining aninterurban car motor suspension spring equally satis-factory for open-type interurban track and rigid con-crete-type city track. If the spring is flexible enoughto serve the purpose well on the rigid track, it is tooflexible for the open tra
. Electric railway journal . to ice that he hasa great deal of trouble with broken trucks. Thisis undoubtedly the result of the very rigid character oftrack while frozen, since he does not have this trouble•on days when the track is in normal condition. Another interesting feature of the mechanical tie isthat it seems to solve the difficulty of obtaining aninterurban car motor suspension spring equally satis-factory for open-type interurban track and rigid con-crete-type city track. If the spring is flexible enoughto serve the purpose well on the rigid track, it is tooflexible for the open track, and if correct for the open-type track it is too stiff for city track. By using the me-chanical tie and the type of track construction which itinvolves, it is plain that approximately the same flexi-bility can be had in city track as is obtainable in open-type country track. The difficulty with the spring istherefore minimized. The flexibility is partly accountedfor by the fact that the : 2 in. of asphalt under the tie. MECHANICAL TIES ON 100-FT. RADIUS SPIRAL CURVE blocks has about the same elasticity, or will compressabout the same amount, as the space which is formedunderneath the rail by the contraction of the concreteas it hardens and pulls away from the base of the when the asphalt has been compressed an ex-tremely small amount, the base of the rail is broughtto bear upon the concrete, thereby making the bearingcore solid as it depresses. It is claimed that the installation of the Dayton me- chanical tie on curves is a more simple operation thanthat of installing other mechanical ties. The reason forthis is that the bearing surface on each tie is only 8in. wide, so that the small amount of play left by thespacing of the holes for the rail clips is sufficient toallow for the curvature of the rail between to the change of the center of bearing on the railat the curves, the setting of the blocks on the ties isspecially arranged for a curve of give
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