It only remained in revenue service a short time before being converted into a tower truck for maintenance of the trolley bus overhead electrical infrastructure.
Those three were converted to electric trolley bus (trackless trolley) operation which survives to this day; diesel buses were substituted on some other routes.
The objective was to determine how trolley buses would perform on such terrain, though not intending to actually convert the route to trolley bus operation.
The buses use 40% less electricity even when compared to an electric trolley bus, mainly because they are lighter and have the regenerative braking benefits.