US PATENT SUBCLASS 246 / 28 R
.~.~ Electric

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.~.~ Electric {18}
29 R  DF  .~.~.~> Radiant energy {2}
31  DF  .~.~.~> Propulsion-current control {1}
33  DF  .~.~.~> Single track
34 R  DF  .~.~.~> Varying-current track circuit {9}
41  DF  .~.~.~> Direct current, normally closed, track circuit {4}
58  DF  .~.~.~> Direct-current, normally open, track circuit {2}
61  DF  .~.~.~> Superimposed propulsion current
62  DF  .~.~.~> Cab signal or train control {7}
77  DF  .~.~.~> Counting in and out {1}
81  DF  .~.~.~> Propulsion-current signaling {3}
86  DF  .~.~.~> Train-carried current supply
87  DF  .~.~.~> Line-current supply {4}
28 C  DF  .~.~.~> Ballast leakage
28 E  DF  .~.~.~> Economy use of line wire
28 F  DF  .~.~.~> Checking circuits
28 G  DF  .~.~.~> Light-out
28 H  DF  .~.~.~> Intermittent light
28 K  DF  .~.~.~> Transformer

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.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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.

SEE OR SEARCH CLASS

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

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