Spirals for Street Railway Curves and Easement curves for Street Railway Branch-

Spirals for Street Railway Curves and Easement curves for Street Railway Branch-

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Spirals for Street Railway Curves and Easement curves for Street Railway Branch-
 
Spirals for Street Railway Curves and Easement curves for Street Railway Branch-offs.  The Pennsylvania Steel Company Frog & Switch Department Complete formulas and tables.  Hard Cover 1906  96 pages.  Some penciled otes in margins.  
THE Spiral System presented in the following pages has been in use by The Pennsylvania Steel Company for the last decade, and has given general satisfaction. It consists of a transition formed of arcs of diminishing radii, and is calculated upon the center line of track, since that is substantially the path followed by the center of gravity of the cars. The purpose of a spiral ending on a short radius street railway curve is not as in steam railroad practice, to enable the super-elevation of the outer rail of curve to be gradually attained, but to reduce the shock due to the change in direction of the car. The switch easements are so designed that a plain curve can be converted into a branch-off with the minimum disturbance of existing work while retaining standard switches and mates, and some simplification of computation is also obtained. The solutions of the various problems given present sufficient information to enable any data required for the laying out or construction of track to be readily secured.

All pictures are of the actual item.  If this is a railroad item, this material is obsolete and no longer in use by the railroad.  Please email with questions. Publishers of Train Shed Cyclopedias and Stephans Railroad Directories. Large inventory of railroad books and magazines. Thank you for buying from us.

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