It was before my time when the local stations in the West Midlands originally had their Sunday services withdrawn, but from what i can find out, of the ex Western Region lines into Birmingham, it seems to be after the summer 1964 timetable. In 1967, the Stourbridge line had just 5 trains on Sundays, calling at Stourbridge Junction, Kidderminster and Droitwich on their way to Worcester and beyond. These too had gone by May 1968.
May 1977 to May 1978.
Table 55 Birmingham New Street to Redditch. No Sunday Service.
Table 66 Birmingham to Coventry. 07.33* 08.33* 09.33 then half hourly at 03 and 33 mins past each hour calling at all stns except Adderley Park to Birmingham International til 22.33.
* Non stop to Coventry.
Table 67 Lichfield City to Birmingham New Street, Stourbridge and Worcester.
No Sunday service
5 trains Birmingham to Worcester via Bromsgrove. 3 calling at Droitwich Spa first stop the other 2 non stop to Worcester Shrub Hill. Worcester Foregate Street closed on Sundays.
Table 68 Stourbridge Junction to Stourbridge Town
No Sunday Service.
Table 69 Birmingham to Manchester.
Birmingham to Wolverhampton local trains.
No Sunday Service.
Table 70 Birmingham to Walsall
No Sunday service
Table 71 Birmingham Moor Street lines.
No Sunday service.
8 trains Leamington Spa to Birmingham New Street, 7 of those calling only at Solihull.
It wasn't just the trains. Many West Midlands bus routes didn't operate on Sundays either, and some of the ones that did, wouldn't start til after 2pm. From what older relatives have said, people generally used to stay in their own areas on Sundays.
The Stourbridge line got its Sunday trains back in May 1983, when British Rail introduced the Express Link service. This provided an hourly all day weekday service calling at Droitwich Spa Kidderminster Stourbridge Junction and Cradley Heath on the way to Birmingham New Street, previously travelling beyond Kidderminster to Worcester was basically rush hours only. At the same time, they put on a Sunday service, which started mid afternoon, and ran approximately 2 hourly calling at Cradley Heath, Stourbridge Junction,Kidderminster,and Droitwich Spa on the way to Worcester and beyond.
The Stratford line had a Sunday service back by 1989, but cant remember exactly when, or the initial frequency.