(under the class definition) Subject matter for the automatic actuation of signals and changeable exhibitors upon the cab or train or for stopping it or controlling its speed, usually by cooperation with means not on the train, but not disclosing a complete block system.
(1) Note. This subclass includes cooperating devices on both roadway and train, (the former including the traction-rail itself, when so used); but where all devices are located on the train this subclass and the indented subclasses are limited to means for preventing railway accidents by automatic signals or train control in cases of derailment, broken parts, improperly-adjusted parts, etc.; ordinary signaling between train occupants or train control exercised by train occupants being excluded. Such signaling will be found in the appropriate subclasses of Class 116, Signals and Indicators, and in this class (246), subclass 166.1.
(2) Note. For similar train control or cab- signaling devices in combination with block-signal systems see "Cab and control" subclasses under the preceding types of block-signal systems.
(3) Note. For motor control automatically exercised by the speed of the vehicle and without cooperating with track devices or axle-driven mechanism search the specific motor classes--e.g., 91, Motors: Expansible Chamber Type, 318, Electricity: Motive Power Systems.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4, 6, 23, 47 to 49, 55 to 57, 59, 62 to 76, 94 to 97, 101, 103, 115, 117, 119, and 394, for cab signal or train control. 7, and appropriate indented subclasses, for teles:graphic or telephonic communication between the train and a roadway-office or other point not on the train.
SEE OR SEARCH CLASS
40, Card, Picture, or Sign Exhibiting,
370, and 463+ for changeable exhibitors on the train electrically actuated or controlled by obstacles upon the track.
91, Motors: Expansible Chamber Type. (See (3) Note).
116, Signals and Indicators,
28, for nonelectric means of communication between occupants of the train or vehicle. (Also see (1) Note).
178, Telegraphy, and 379, Telephonic Communications, appropriate subclasses for electrical means of communication between occupants of the train or vehicle.
293, Vehicle Fenders,
5, 6 and 7.
318, Electricity: Motive Power Systems (see (3) Note).
340, Communications: Electrical, appropriate subclasses. 379, Telephonic Communications. (See Class 178 above).
381, Electrical Audio Signal Processing Systems and Devices,
82+, for a public-address system for a train, and subclass 86 for other electrical one-way audio signal transmission in a train.
