Doesn't the train run from Nottingham on Sundays?
There is one through service in each direction, 2L50 1356 Cleethorpes to Nottingham which should be formed of a single 156. The journey in the opposite direction is 2T45 1529 Nottingham to Cleethorpes, which I think should be formed of 2x 153.
In relation to the earlier question, I've seen the 1135 formed of 3 carriages before but it's the exception rather than the rule. Due to the stopping patterns on the Newark end, plus 2L50 through to Nottingham, anything other than 2 carriages is awkward to work due to short platforms at Swinderby, Collingham and Newark Castle. Though of course during the winter, the 1105, 1300 and the 1500 from Lincoln are all a 156/153 combination.
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Is it normally busy? I'm doing the service through from Newark on Sunday.
They're not normally crowded.
The only thing that tends to really fill them up is Market Rasen races, so it's worth having a check if they're on. Racing crowds can be VERY rowdy.