EMR have had a few, especially before and during COVID
- As the Liverpool to Norwich service splits at Nottingham, the other portion often works other services before/after, sometimes as per diagram, sometimes as last minute arrangements. RTT often got confused and showed services as Liverpool to Norwich & Worksop for example
- Peterborough to Nottingham via Leicester (this service only runs one way once a day), which then formed a service to Derby
- One or two late night Norwich to Nottingham services then formed services to Derby. I actually travelled from Norwich through to Derby once in EMT days
I can think of a few that were actually advertised as through services, although none of them lasted long at all
- A single Derby to Lincoln Central morning journey
- A single Matlock to Skegness early morning journey
- A single Mansfield Woodhouse to Norwich journey
Northern must have quite a few interworking journeys. I know they did a Lincoln to Sheffield service which then formed a Hull service, but I can’t remember if it was separate or a through journey.
One interesting thing is a Nottingham to Leeds journey which then forms a service to Manchester Victoria, theoretically giving a service from Nottingham to Bradford Interchange on the same train, something that was planned under Northern Connect