Service B86 was introduced on Sunday 1st October 1939, as a short-working variation to new Service B87, running only between Birmingham City Centre (Edmund Street) and Oldbury.
On Saturday 29th June 1968, Birmingham City Transport (BCT) closed their Rosebery Street depot, which had been responsible for their share of working on this group of routes. The work as moved to other depots, and for simplicity the “Bâ€-prefix was dropped from the route numbers. Service B86 was renumbered to Service 86 at this time.
BMMO's share of Service 86 working passed to West Midlands Passenger Transport Executive (WMPTE) on Monday 3rd December 1973, with the 1973 Transfer of Services and Assets to WMPTE.
See Service B87 for more information on this group of services.