I know with Watford Stadium Halt the main purpose was not so much for home fans but rather for away fans as in those days Watford had a bad reputation for hooliganism meaning it made sense to take the away fans directly to the stadium by train...
I take very great exception to this statement which is rubbish. In the 80s under the great Graham Taylor, Watford FC were one of the first (if not the first) to develop the idea of a "family club". There was very little "hooliganism" in the Vicarage Road ground - except sometimes by the away fans - virtually nothing of note by the home fans. Wikipedia mentions the Halt being built for "crowd control" - i.e. for the large number of away fans (especially from London clubs) in the top division.
Imdeed, other clubs (notably the small club up the M1 motorway) in the 80s were installing huge and high fencing around the pitch (which in Luton's case probably exacerbated the bad outbreak of Millwall violence in 1985 as the fans could not see very well with this fencing - I can vouch for that).
Watford never had any high fencing around the pitch, either at the away end or home terracing - just a low wall. The away fans were treated very well and taking them directly to the stadium by train was certainly not to protect them from any "hooliganism" from the home fans. With Watford's relegation from the top division in 1988, the Halt was less and less needed and used. Actual closure date is unknown.
Perhaps thenorthern had an unfortunate but rare experience at Vicarage Road.
Anyway, my only experience with using Bordesley was in 1968 when I accompanied a Portsmouth-supporting school friend to a game at St Andrews, which Pompey lost 5-2. The station at that time was looking a little run down but not terminal. We also visited Snow Hill, which had closed the previous year (except for the Wolverhampton shuttles) - what a very sad sight it was...