US PATENT SUBCLASS 246 / 309
.~.~.~.~.~.~ Yielding rail

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

270 R  DF  VEHICLE-ENERGY ACTUATION {11}
292  DF  .~ Signals and gates, automatic {2}
297  DF  .~.~ Track mechanism {7}
304  DF  .~.~.~ Vehicle-restrained gates and doors {3}
307  DF  .~.~.~.~ Vertical motion {1}
308  DF  .~.~.~.~.~ Swinging {1}
309.~.~.~.~.~.~ Yielding rail

DEFINITION

Classification: 246/309

(under subclass 308) Subject matter including a track-rail which yields vertically under the weight of the train, thereby actuating the gate or door.