US PATENT SUBCLASS 246 / 454
CROSSINGS, FROGS, AND MATES

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

454CROSSINGS, FROGS, AND MATES {11}
455  DF  .~> Outer-tread-supported wheel
456  DF  .~> Tread guard rail
457  DF  .~> Flange-supported wheel {1}
459  DF  .~> Hot filled
460  DF  .~> Central inserts {1}
462  DF  .~> Plate or plate bolted
463  DF  .~> Bolted
464  DF  .~> Solid
465  DF  .~> Crossings {2}
468  DF  .~> Frogs {3}
472  DF  .~> Details

DEFINITION

Classification: 246/454

(under the class definition) Subject matter having means placed at the common point of two or more traction-rails or opposite a tongue-switch and arranged to permit the passage of the wheel-flanges.

SEE OR SEARCH CLASS

238, Railways: Surface Track,

151, for filler-blocks and other devices used as foot-guards in crossings, frogs, and mates.