The change has been prompted by a major update to the timetable on the East Coast Main Line, the busy route between London, Leeds, York, Newcastle and Edinburgh.
EMR, external and LNER, external trains share part of the route, including a section between Grantham and Peterborough. There is also a bottleneck near Newark caused by a flat crossing where London to Edinburgh and Nottingham to Lincoln lines pass over each other, limiting the number of trains allowed to pass.
The timings of almost all LNER trains calling at Newark Northgate in Nottinghamshire will change.
There will be more trains to London, Doncaster, Wakefield, Leeds and Bradford Forster Square, with faster journey times, it was confirmed.
There will be hourly direct trains to Leeds and Edinburgh all day, seven days a week.
Further up the line, the timing of LNER and Hull Trains services calling at Retford will change. There will be slightly more LNER trains stopping on weekdays but fewer on Sundays.