Celebrations are due to begin to mark 25 years since the Carlisle to Settle railway line was saved.
It had been threatened with closure since the early 1980s until Michael Portillo, the transport secretary at the time, saved it.
A commemorative train ride will take place later this morning.
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Sandy Murray, of Police Scotland, was was giving evidence at the trial of a bus driver who denies killing Ryan Baird by dangerous driving.
34-year-old Christopher Peck was involved in a head-on crash with a drunk driver. His funeral has taken place in his hometown, Workington.
The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.