Information about the R142 and R142A door control

Do you know some part of the R142A and the R142. Do you want to know something cool WELL THEN CHECK  THIS OUT.
THE Master door controller is the way how the passengers get in and out of  the train. Its uses the master control key and has 3 positions RUN, ON, TERM. Run activtes the traction motors of the train and disables the doors. ON acvivates the doors and disables the traction motors also when you turn it to that position they key can not come out of the slot. Term disables any door activity in the cab but allows the key to be removed.