bolsterless en · ADJ
Etymology
From bolster + -less.
Meanings
-
(not-comparable) Without a bolster.
Bolsterless trailer bogies have been used, incorporating in the construction laminated springs mounted on the axle boxes, and steel helical springs with auxiliary rubbers, thus maintaining the high standard of springing of the swing bolster bogies.
1950 January, “British Railways Double-Deck Suburban Stock”, in Railway Magazine, page 57: