By the standards of the various now-defunct trolleybus systems in the United Kingdom, the Darlington system was a moderately sized one, with a total of 5 routes, and a maximum fleet of 66 trolleybuses.[2] It was closed relatively early, on 31 July 1957 (1957-07-31).[1][2]
None of the former Darlington trolleybuses are recorded as having been preserved.[3]