Not really Birmingham, but , despite ther being no evidence for it, I still like to think that the Cadbury rail systems, which was close to where the Rev, Avery lived, had some influence on Thomas the Tank engine. A u tube video discusses the models used to produce the TV series, some of which are being auctioned in aid of The Autistic Society. I had never realised the effort made to include small details on them for historical accuracy (apart from the faces)