I think the service pattern between Wolverhampton and Birmingham should be (December 2018):
Manchester Piccadilly - Bournemouth (XC) EXPRESS
Manchester Piccadilly - Exeter St Davids (XC) EXPRESS
Liverpool Lime Street - London Euston (LNR) EXPRESS
Liverpool Lime Street - Birmingham International (LNR) COSELEY, TIPTON, DUDLEY PORT, SANDWELL & DUDLEY, SMETHWICK GALTON BRIDGE AND SMETHWICK ROLFE STREET
Scotland - London Euston (VT) SANDWELL & DUDLEY
Shrewsbury - Birmingham New Street (WMR) SANDWELL & DUDLEY
Shrewsbury - Birmingham New Street (WMR) COSELEY
Wales - Birmingham International (AW) SMETHWICK GALTON BRIDGE
Crewe - London Euston (LNR) via Stoke SMETHWICK GALTON BRIDGE
Wolverhampton - Walsall (WMR) COSELEY, TIPTON, DUDLEY PORT, SANDWELL & DUDLEY, SMETHWICK GALTON BRIDGE AND SMETHWICK ROLFE STREET
So this would provide:
Coseley 3ph
Tipton 2ph
Dudley Port 2ph
Sandwell & Dudley 4ph
Smethwick Galton Street 4ph
Smethwick Rolfe Street 2ph