noun
master controller; train speed control lever
Wasei-eigo term for the lever used by a train operator to control speed. Not a general-purpose 'master controller' in English.
wasei-eigo (Japanese-coined English), from master controller
運転士はマスターコントローラーを操作して電車を加速させた。
The driver operated the master controller to accelerate the train.
Variant with interpunct; less common but seen in some technical contexts.
Wasei-eigo from English 'master controller', specifically referring to a train's speed control lever.