The EMR timetable proposed off-peak timetable will have departures from St Pancras something like:
- 1000: Kettering and stations to Nottingham
- 1003: Luton AP and stations to Corby
- 1015: Leicester and stations to Sheffield
- 1030: Kettering and stations to Nottingham
- 1033: Luton AP and stations to Corby
- 1045: Leicester and stations to Sheffield
The 1003, with a lower top speed and extra stops, will be overtaken by the 1015 somewhere north of Bedford and get to Kettering about 9min before the 1030, thereby providing the connection.
What you propose would have the 1000, 1003, 1030 and 1033 going to Leicester and the 1015 and 1045 to Corby so passengers for Leicester might have to wait 27min rather than just 15min maximum.
But that 15min clockface departures for Leicester is at odds with what EMR say in the timetable consultation when there is a question about stopping a Sheffield service at Kettering: "The Sheffield and Nottingham trains have to leave London St Pancras International quite close together and therefore stopping a Sheffield service at Kettering would add significant journey time, as the Nottingham service would have to wait behind it."
I'm reading that to mean that a Nottingham departs directly after a Sheffield. What you are saying cannot be right - a Kettering stop doesn't impact the service behind as it is 15mins away!
The EMR consultation implies the pathings are something like:
xx00: Sheffield fast (Leicester, Derby, Chesterfield, Sheffield)
xx03: Nottingham semi-fast (first stop Kettering)
xx15: Corby
xx30: Sheffield semi-fast (first stop Leicester)
xx33: Nottingham fast (first stop Kettering)
xx45: Corby
I was proposing swapping the xx30 and xx33 over, with a Kettering stop in the Sheffield vice the Nottingham, so the pattern would be:
xx00: Sheffield fast (Leicester, Derby, Chesterfield, Sheffield)
xx03: Nottingham semi-fast (first stop Kettering)
xx15: Corby
xx30: Nottingham fast (first stop Market Harborough)
xx33: Sheffield semi-fast (first stop Kettering)
xx45: Corby