self-changing en · ADJ
Etymology
From self- + changing.
Meanings
-
(not-comparable) Of a gearbox / transmission that changes gear automatically to a preselected gear.
The gearbox is of the self-changing compound epicyclic SE.4 type, with Sinclair fluid coupling, having a maximum torque of 750 lb./ft.
1960 September, “Inter-city diesel units for the Hull-Liverpool service of the N.E.R.”, in Trains Illustrated, page 561: