Definition of "springing"

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

In general, steel springs were stipulated for primary suspension, although rubber was accepted for auxiliary springing; hydraulic dampers were specified and the use of laminated springs ruled out.

1960 December, “The first hundred 25 kV a.c. electric locomotives for B.R.”, in Trains Illustrated, page 726

The arch failed first at the crown, then at the quarterings, and finally at the springings. After demolition the girders for half the new structure were erected on bedstones already built on the abutments behind the springings of the old arch.

1941 February, “Bridge demolition by lifting”, in Railway Magazine, pages 74–75