dk1
Veteran Member
Will probably depend on whether other operators have cancelled paths that would normally run and as such would normally be in the way. Additionally it will depend on whether operators want to provide such a service, requires units and crew, cost vs revenue.
Here at GA we operate relief trains as a matter of course on the Norwich-Cambridge route whether it be through engineering works on the main line or simply due to football. Has been something we have done for the last 10 years or more.