This was the reason behind my thinking, Cleethorpes is cut off from the rest of the northern franchise. Even with a daily northern services on the Brigg line, a crew depot at Cleethorpes will not be justified. If it is given to the East Midlands franchise, with an improved service to Lincoln, a crew depot may be justified.
I would even go as far as saying the depot should be improved at Cleethorpes to cover light maintenance. There is room to build a small shed. You'd then have the cost savings of running trains empty to Nottingham from Lincoln and Sheffield from Barton. Stock would be in the correct position to cover flows. For example the morning flows are mainly Grimsby -> Lincoln -> Nottingham and vice versa in the evening.
I also think that if the East Midlands Franchise took over the running of stations like Habrough, Healing and Stallingbrough they may be encouraged to invest in real time information screens, free parking (Habrough) and increase services at the latter. This investment isn't really justified for the rural Barton service but could be if the Lincoln line is included.
I believe that the Grimsby to Lincoln route has real potential. I've been on a full and standing class 156 before but demand is suppressed by lack of advertisement, no clock face timetable and unsuitable stock. The line under central was run by class 170's, 158's and 156'. Now it's almost always 153's. Hopefully with the Lincoln 2 hourly London service, the Grimsby trains will be run to Nottingham/Derby with connections at Lincoln for London. What is really needed is a group for the line to demand a better service. There is the Market Rasen rail users group but I feel they'd have more success if the whole line was represented to get more people involved and a more clear set objectives thought out similar to the Brigg Line group.
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Market Rasen to Louth & Bourne to Spalding are already connected by bus. The level of demand is such that it is restricted to one or two a day or certain days only. Horncastle is linked to Sleaford & Lincoln by bus. Can't see the demand for a Horncastle to Metheringham link when the journey is possible through by bus.
You may be right with Horncastle it may not have the demand as I don't think there is a particular flow. My proposal is different to a bus service though. Rural bus services are usually slow and try to serve as many community's as possible. The service I propose would be limited stop, connect into the train service, be included in the timetable and would use through tickets. It would basically be a train service run by buses. For example the Louth service would connect into services heading towards Lincoln at Market Rasen. The bus would be of similar comfort level to a train. You would get on buy your ticket to were you want to go. Nottingham, London, Birmingham even Paris and Brussels.