And on that bombshell:
Updated list of all the WMR branded trains/stations (as of 14/1/19).
Mods - feel free to pin this to the front of the thread.
Stations
Stour Valley Line (COV-WVH, exc. COV, BHM & BHI)
All WMR-operated stations between Coventry (exc.) & Wolverhampton (inc.) are in WMR orange & grey, with Network WM or LM signage.
N.B. Wolverhampton also has WMR signs/signage.
Cross-City Line (LTV-BMV/RDC, exc. BHM)
>Lichfield Trent Valley: LM signs, green/black (LM) lampposts
>Lichfield City: LM signs, green/black (LM) lampposts
>Shenstone: LM signs, green/black (LM) lampposts
>Blake Street: Network WM signs, green/black (LM) lampposts
>Butlers Lane: Network WM signs, green/black (LM) lampposts
>Four Oaks: Network WM signs, green/black (LM) lampposts
>Sutton Coldfield: Network WM (Olympic gold) signs, green/black (LM) lampposts
>Wylde Green: Network WM signs, green/black (LM) lampposts
>Chester Road: Network WM signs, green/black (LM) lampposts
>Erdington: Network WM signs, green/black (LM) lampposts
>Gravelly Hill: Network WM signs, green/black (LM) lampposts
>Aston: Network WM signs, green/black (LM) lampposts
>Duddeston: Network WM signs, green/black (LM) lampposts
>Five Ways: Network WM signs, green/black (LM) lampposts
>University: Network WM signs, green/black (LM) lampposts
>Selly Oak: Network WM signs, green/black (LM) lampposts
>Bournville: Network WM signs, Purple "Cadbury" lampposts
>Kings Norton: Network WM signs, green/black (LM) lampposts
>Northfield: Network WM signs, green/black (LM) lampposts
>Longbridge: Network WM signs, green/black (LM) lampposts
>Barnt Green: LM signs, green/black (LM) lampposts
>Alvechurch: LM signs, green/black (LM) lampposts
>Redditch: LM signs, green/black (LM) lampposts
>Bromsgrove: non-standard signs, blue/yellow lampposts
Snow Hill Lines (Dorridge/Stratford-u-A - Ledbury via Snow Hill & Worcester)
With the exception of Stratford-upon-Avon Parkway, all WMR-operated stations from Stratford-upon-Avon to Earlswood have LM Signs with old-style GWR lampposts (N.B. not sure about The Lakes); all stations from Wythall to Spring Road have Network WM Signs and the same lampposts.
>Stratford-upon-Avon Parkway: LM signs, orange/grey lampposts (updated as of 17/1/19)
>The Lakes: LM signs, green/black (LM) lampposts (AFAIK)
>Widney Manor: Network WM signs, orange/grey lampposts plus other WMR features
>Olton: Network WM signs, orange/grey lampposts plus other WMR features
>Acocks Green: Network WM signs, orange/grey lampposts plus other WMR features
>Tyseley: LM signs, old-style GWR lampposts; depot has orange/grey lampposts
>Small Heath: Network WM signs, unpainted lampposts
>Bordesley: Network WM signs, orange/grey lampposts
>Birmingham Snow Hill: WMR signs/signage, orange/purple lampposts
>Jewellery Quarter: Network WM signs, orange/black/grey lampposts/fences
>The Hawthorns: Network WM signs, green/black (LM) lampposts
>Rowley Regis: Network WM signs, green/black (LM) lampposts
>Old Hill: Network WM signs, green/black (LM) lampposts
>Cradley Heath: Network WM signs, green/black (LM) lampposts
>Lye: Network WM signs, green/black (LM) lampposts
>Stourbridge Junction: Network WM signs, green/black (LM) lampposts
(>Stourbridge Town: Network WM signs, green/black (LM) lampposts)
>Hagley: LM signs, old-style GWR lampposts
>Blakedown: LM signs, green/black (LM) lampposts
>Kidderminster: LM signs, green/black (LM) lampposts
>Hartlebury: LM signs, green/black (LM) lampposts
>Droitwich Spa: LM signs, green/black (LM) lampposts
>Worcester Shrub Hill: LM signs, green/black (LM) lampposts
>Worcester Foregate Street: LM signs, green/black (LM) lampposts
>Malvern Link: LM/old-style GWR signs, old-style GWR lampposts
>Great Malvern: LM signs, old-style GWR lampposts
>Colwall: LM signs, green/black (LM) lampposts
>Ledbury: LM signs, old-style GWR lampposts
Chase Line (Aston (exc.) - Walsall - Rugeley TV (exc.))
All WMR-operated stations between Aston (exc.) & Rugeley Trent Valley (exc.) are in WMR orange & grey, with Network WM or LM signage (Rugeley Town only), with the exception of Witton (still in LM green/black AFAIK).
N.B. AFAIK, Perry Barr & Hamstead still have yellow handrails, and Bloxwich, Bloxwich North & Landywood still have green shelters.
Others
>Water Orton: WMR signs/signage, orange/grey lampposts (updated as of 25/1/19)
>Wilnecote: LM signs, orange/grey lampposts
>Coleshill Parkway: LM signs, unpainted posts (WMR orange shelter)
>Stone: WMR signs, orange/grey lampposts & handrails
>Kenilworth: similar to Bromsgrove
>Coventry Arena: LM signs, orange/grey lampposts
>Bedworth: LM signs, orange/grey lampposts
>Bermuda Park: LM signs, orange/grey lampposts
>Bilbrook: LM signs, old-style GWR lampposts
>Codsall: LM signs, old-style GWR lampposts
>Albrighton: LM signs, old-style GWR lampposts
>Cosford: LM signs, old-style GWR lampposts
>Shifnal: LM signs, old-style GWR lampposts
>Telford Central: LM signs, green/black (LM) lampposts
>Oakengates: LM signs, old-style GWR lampposts
>Wellington: LM signs, old-style GWR lampposts
>Penkridge: LM signs, old-style LMS lampposts
Trains
Class 139
139001: LM livery, WMR branding
139002: LM livery, WMR branding
Class 150 (all to transfer to Northern):
150105: LM livery, WMR branding
150107: ditto
150109: ditto
Class 153 (all to transfer to EMT):
153334: LM livery, WMR branding
153354: ditto
153356: ditto
153364: ditto
153365: ditto
153366: ditto
153371: ditto
153375: ditto
Class 170/5 (2-cars, due to leave the franchise) - all in WMR "outgoing" livery
Class 170/6 (3-cars, due to leave the franchise) - all in WMR "outgoing" livery
Class 172/0 (2-cars, ex-London Overground)
172001: still with LO
172002: at Tyseley for crew training/familiarisation
172003: as per 001
172004: as per 001
172005: as per 001
172006: at Ilford awaiting mods, refurbishment & repaint
172007: as per 001
172008: as per 001
Class 172/2 (2-cars, with gangway)
172211: LM livery, WMR branding
172212: ditto
172213: ditto
172214: ditto
172215: ditto
172216: ditto
172217: ditto
172218: ditto
172219: ditto
172220: ditto
172221: ditto
172222: ditto
Class 172/3 (3-cars, with gangway) - all in FINAL WMR livery
Class 323 (due to leave the franchise) - all in outgoing WMR livery
323201-213: WMR "outgoing" livery
323214: WMR "outgoing" livery (updated as of 17/1/19)
323215-221: WMR "outgoing" livery; (217 is currently being made 2020 compliant, and 221 has BTP branding on centre coach and retains grey doors)
323222: WMR "outgoing" livery (updated as of 17/1/19)
323240: WMR "outgoing" livery
323241: WMR "outgoing" livery (updated as of 17/1/19)
323242: WMR "outgoing" livery
323243: WMR "outgoing" livery (updated as of 17/1/19)
(NB: WCML stations and Class 230s, 319s and 350s are omitted as they fall under the LNWR umbrella and this list focuses on the WMR side of things)
Feel free to quote this post with any updates to the list!