(under subclass 20) Systems in which the train automatically cooperates with human agency in the actuation or control of the elements of the system.
(1) Note. These systems are sometimes called "controlled Manual". The electric control by trains of manually- actuated signals or vice versa is an example of such cooperation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
105, 106, 112, 160, 164, 165, and 183, for manual-control features.
