ry quickly
OK, I think I now (at last - my bad) understand your point. But
as a local station just where are the passengers going to go?
Wymondham/Attleborough/Thetford? You are already next to the A11 - quicker and more convenient to keep in the car and drive.
Cambridge? Possibly, but as above with the rider that Cambridge is pretty much unfriendly for cars when getting there so perhaps a few takers for leisure travel. Commuting possible and may be increasing, but how many Norwich dwellers as a whole commute to Cambridge just now?
Peterborough? Perhaps a few but for most Peterborough is an interchange rather than a destination.
You are then getting beyond the arc of daily travel (apart from Ipswich/Colchester/London for which this station would not help) so getting to and from Norwich Station would not be a major issue for most.
I am not yet motivated to do any sums!
Hmmm. Obviously this is a lesson in my (in)ability to compose crystal clear, unambiguous text here
By 'small station' I meant one with platforms built to suit the local service - which I assume would not need to be larger than 4 (or 5?) 30m carriages. (And therefore much cheaper than one built on the main line to London.)
When I wrote "as a local station for those nearby" I meant that a station at or near either a) at or near the A140 Ipswich Rd or b)
Keswick Low Rd or c) Intwood Rd (the latter two both on the SW extremities of Norwich, but still inside the ring road, would have a local population/catchment area within walking distance of the location. So none of these sites would rely 100% on pure 'parkway' type demand.
My guess is this would be especially true of the Ipswich Rd site, which has a college and Holiday Inn close by. That site, however, would not appear to be so attractive to folks in north-west Norwich, who I guess would have to travel further round the ring road. (so they might as well just get themselves into central Norwich for the current station.)
If a station were built by the side of the A11, just outside the ring road (let's call that site d) it would surely be more attractive to folks in NW and north north Norwich, but would appear to have no local population to speak of within walking distance of the station.
Certainly, I can see that, as parkway stations, none of these sites would attract many pax to or from Thetford (as you say, for most folks, once in the car, let's drive all the way). No doubt some would be dropped off for Ely/Cambridge on a regular basis, however - depending on what train service were to be provided. And a station at Ipswich Rd would, I assume, attract some inward traffic to the college and maybe Holiday Inn.
However, the passengers I thought any such station could attract would be folks going on more "strategic" journeys - so you might say anyone going beyond Cambridge or March who were not commuting on a daily basis - and who would find the 'parkway' station far more accessible than the current set up.
Again, I am speculating. I feel sure any one of these station sites - had they been inherited - would be useful for passengers today. Whether there is space at any of these sites for a new station, or whether it makes economic sense today to build them new is another matter.