I used to like that different towns, cities etc. had different colour buses. Birmingham: dark blue/cream, West Brom: lighter blue/cream, Walsall: blue, Wolverhampton: was it green/yellow? not sure. Gave them some identity unlike today when (I think) all West Midlands buses are red? Also, Walsall retained trolley buses later than other midland boroughs. I thought they were excellent. Much better than trams.
Also, West Bromwich buses almost always had the local reg. no.ending EA and Birmingham OA, OB,OC etc.
(my wife often picks me up for using Black Country pronunciation buzzes, no she says, they're busses.)