You are being deliberately obtuse here i think. It is nothing like that, could you expand on how it is similar to "Derby has good connections to London and Sheffield, why does it need a line to Birmingham as well". I am suggesting that a small town with a good service to two cities, does not need an increased service to a bigger, further away city.
If you are commuting into Leeds on a 1tp2h service, the consequence of missing that service is so high that you just drive. Sundays are irrelevant to the argument.
I don't disagree with the point that demand for this route would be a gamble - certainly at the intermediate stations. I would, however, highlight that Snaith is both reasonably sized and reasonably affluent, meaning it may have somewhat of a propensity to use rail. Looking beyond the intermediate stops, I think what may be being missed is the benefits of a Goole to West Yorkshire service. Whilst there is obvious benefit connecting to Leeds (in terms of near every metric, its offers more than Sheffield/Hull and substantially more than Doncaster), theres also the connectivity benefits of serving Pontefract/Castleford, especially as Castleford is itself becoming a bit of a useful connection node for York. One question for me would be how much it would tip the scales to run this Wakefield and connect an additional city/key interchange stations.
I strongly disagree with the point that 2tph is not substantially different to 2tpd. I can say with confidence that 2tph will be better used, the conundrum is just if they could drum up enough demand/social benefit to justify their existence.
Historically, there was always 3tpd to Goole with an additional lunchtime service. This was dropped under serco/abellio Northern. Personally I would see that as a touch more attractive if I lived that way out, but 2tph makes the train a viable prospect for some journeys, rather than only useful if the stars align.


