The original number 4 ran from the city, doing the city loop to Harborne. It ran at the same time as the 3/3a routes and was discontinued in 1954. As someone whose youth was spent on the 5/7 route, on a visit back to the city, I got a nasty shock to see a number 5 bus at Solihull station, but was releived to see it was a diffrent colour to the one i used to use.