Moderator note: Split from https://www.railforums.co.uk/threads/routeing-query-birmingham-to-southampton.233429/
Wouldn't it all be easier or everybody if it was all singles with no break of journey allowed?Probably.
In principle, it wouldn't be permitted to stop off at Stratford-upon-Avon (SAV). This is because, whilst SAV is shown on map RB, you would have to double back between Wilmcote (WMC) and SAV to stop off in SAV - and doubling back is generally not permitted when tracing a mapped route.
Now, one of the exceptions to this general rule is that you can double back between stations that are members of the same Routeing Point Group for interchange purposes. And since WMC, Stratford-upon-Avon Parkway (STY) and SAV are all members of the Stratford-upon-Avon Routeing Point Group, this would in theory allow you to travel via SAV.
However, this is said to be for interchange purposes only - suggesting that cannot break your journey when relying on it. How enforceable that is, given there aren't any barriers at SAV, is another matter...
I note there is a negative easement which prohibits going via SAV on certain journeys:
However, based on the wording, this only applies for journeys that are to or from Leamington Spa (LMS), not just via there - and you fall into the latter cetegory. But some journey planners interpret it as prohibiting the route via SAV.
Other journey planners (including, importantly, National Rail Enquiries) are willing to offer itineraries via Stratford and so I think you would be entitled to rely on these in justifying your route. It's worth noting that the Off-Peak Return in question, as with most such fares, has no general bar on break of journey. So most journey planners tell you that break of journey is permitted en-route, subject to any restrictions shown in the restriction code. As there is nothing in the restriction code here, I think you would be on fairly safe ground.
As the worst case scenario when breaking your journey where not permitted to do so, or travelling via a non-permitted route, is to have to pay an excess fare - I think I would not be overly concerned about doing this.
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