rollability en · NOUN
Etymology
From roll + -ability.
Meanings
-
(uncountable) The quality of being rollable.
Like Tees, Tyne and Healey Mills are semi-automatic in operation, in that the hump operator personally controls the secondary retarders, on which he selects one of six leaving speeds, based on his judgment of a cut's rollability and speed and the degree of siding occupation on its destined route.
1963 September, “The new Tyne and Healey Mills yards of the North Eastern”, in Modern Railways, page 164: