US PATENT SUBCLASS 246 / 113
.~ Automatic

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

111  DF  GRADE-CROSSING TRACK PROTECTION {3}
113.~ Automatic {2}
114 R  DF  .~.~> Electric {2}
116  DF  .~.~> Fluid pressure

DEFINITION

Classification: 246/113

(under subclass 111) Subject matter having means actuated or controlled automatically by the approaching train and without

the intervention of human agency.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21, 27 and 125+, which have automatic actuation or control of the type required, for systems of automatic actuation and control.

111, 125, 260, 293, and 473, and appropriate indented subclasses for signal structure.

118, for drawbridge protection is general.