By the standards of the various now-defunct trolleybus systems in the United Kingdom, the Doncaster system was a moderately sized one, with a total of 6 routes, and a maximum fleet of 47 trolleybuses [REF].
One of the former Doncaster trolleybuses, a Roe-bodied Karrier W4,[REF] is now preserved, at the Trolleybus Museum at Sandtoft, Lincolnshire [REF].