My guesses would be, as Birmingham and the west midlands is a very industrial area, perhaps it led to some GWR Warfs or Warehouses?
Did it ever have rail installed on it?
Probably marginally shorter than the current route past St Andrews Football Ground but any time saving would be negligible.Would the route into New Street from Oxford be any quicker than it is now?
Are there any closed, mothballed or never completed routes around Birmingham that, if reopened, would make a considerable difference to the speed of services approaching the city?
It's used hourly by the Manchester to Bristol service. It also keeps a considerable amount of freight activity out of New Street and off the Cross City line between there and Kings Norton, where it would be sure to cause congestion. It doesn't come under any of the categories of closed, mothballed or never completed.The Camp Hill Line. There has been a lot of campaigning to re-open it. It's used occasionally by trains coming from Bristol/Cheltenham...
Given that the entrance to HS2 Curzon Street station is going to be as near as is possible to Moor Street station without the two sharing a concourse, I think that a link into Curzon Street from the Snow Hill lines would be entirely superfluous. Particularly when you consider that almost all local services on the Snow Hill lines do not terminate in Birmingham city centre anyway but instead run through it.Or possibly a means to get local access into Curzon Street so that you can actually change to something when getting off your HS2 train.
Are there any closed, mothballed or never completed routes around Birmingham that, if reopened, would make a considerable difference to the speed of services approaching the city?
The Camp Hill Line. There has been a lot of campaigning to re-open it. It's used occasionally by trains coming from Bristol/Cheltenham...
Not quite Birmingham, but a reopened Stourbridge Jn-Dudley-Tipton line would be very valuable.
It's still open for freight to Dudley, from where there is a gap of only about 2 miles to the existing main line west of Tipton.
The alignment is still reasonably intact I think.
The old line (OW&W/GW) ran on to Wolverhampton LL but there was a spur to the High Level line at Tipton.
Cotswold line traffic could extend from Worcester via Dudley and terminate at Wolverhampton (as they used to).
Trouble is nobody would want a new conflicting junction at Tipton.