The West Midlands Combined Authority has now published this document:
https://westmidlandscombinedauthority.org.uk/media/1178/2016-06-01-mfg-full-document_wmca.pdf
Figure 4.3: Metropolitan Rail and Rapid Transit Network Map on page 16 is worth looking at.
https://westmidlandscombinedauthority.org.uk/media/1178/2016-06-01-mfg-full-document_wmca.pdf
Figure 4.3: Metropolitan Rail and Rapid Transit Network Map on page 16 is worth looking at.