US PATENT SUBCLASS 246 / 28 C
.~.~.~ Ballast leakage


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

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27  DF  .~ Automatic {5}
28 R  DF  .~.~ Electric {18}
28 C.~.~.~ Ballast leakage

Unofficial Alpha Subclasses: R C E F G H K

DEFINITION

Classification: 246/28

(under subclass 27) Systems in which the traffic- controlling devices are actuated and controlled only by electrical means.

(1) Note. The means employed upon the train for operating cab signal and train-control mechanism may by of any type--e.g., electrical, fluid-pressure, mechanical, etc.

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22, for semi-automatic block signaling systems in which electrical means are used for performing the automatic function.

114+, for automatic grade-crossing protection systems having electrical means for operating the protecting means.

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104, Railways, 238, for vehicle propulsion control by block system wherein a

peculiar type of guideway is claimed (e.g., cable, model, overhead, etc.).