Leslam has very kindly supplied the attached pictures of classic Harborne buses. They are from Martin Hampson's
Harborne: The Second Selection (Tempus, 2002, ISBN 07524 26583) and are captioned as follows:
[1] The first horse bus ran between Harborne and Birmingham, c 1840, taking an hour, but becoming an instant success, since it also catered for people travelling for short distances. Initially, dozens appeared, mostly operated by proprietors owning one or two vehicles only; but by 1849 the service was run solely by a Mr Turner, who ultimately amalgamated with a later rival, Mr Taylor. This photograph of c 1900 shows a bus owned by City of Birmingham Tramways, licensed at this time to operate nine horse buses per hour between New Street and Harborne.
[2] This Thornycroft motor bus, also operated by City of Birmingham Tramways, was actually hired from London Motor Omnibus Co, and was run in Birmingham for a few months during 1905. It is seen here at Five Ways on the Birmingham-Harborne run. With a rear entrance and outside stairs, it carried twelve passengers inside and eighteen upstairs.
[3] Built in 1912 for Midland Red (successor of CBT), this Tilling-Stevens motor bus was taken over in October 1914 by Birmingham Corporation following the city's Act of the same year; thirty buses were transferred along with the Tennant Street (Five Ways) garage. Seen here, in around 1920, and withdrawn in 1924, it carried sixteen passengers inside and eighteen outside. There was a rear entrance and external staircase.
[4] A motor bus bound for Birmingham, with solid tyres and outside stairs, waits by Harborne Terrace, c 1926. Although the possibility of a tram service to Harborne had been considered, plans were abandoned following opposition from the Calthorpe Estate, who allowed tram services on the fringes of Edgbaston (Hagley Road and Bristol Road), but vetoed trams passing through Chad Valley, the heart of the garden suburb.