This is certainly an interesting discussion I've provoked. Looking again at the map and going into pure hypotheticals, if an airport station - "Bristol International" was to be built, would situating the station on the Stoke Gifford / Avonmouth line even work?
My initial comment suggested reversing mainline trains using the spurs but would train operators allow for this? Or would a passenger transfer at Parkway onto a sprinter / 158 shuttle work if it can't even justify its operating costs?
Bristol Parkway' location itself presents issues as an airport station as trains from the south west to Wales don't stop there unless they reverse?
Personally, I thought transfer from Parkway would be the most likely using trains down the line to Avonmouth or trams / monorails right into the aiport complex.
Or....Purely hypothetical.
Would a re-modelling of the entire track layout have worked better so as to allow no reversing and all main line services to stop and carry on? The diamond area between the tracks used to be FIlton CE tip and lots of waste land so it could have been very different. Thoughts?
I like the idea of Bristol becoming the equivalent of Manchester, claiming Lulsgate and Rhoose traffic and maybe some other stuff. Also the idea of a station beneath the runway like Zurich would have been amazing but not really the best potential model railway. All a dream now anyway as they're just going to build houses on it.