Strike action will have a major impact on train services in and out of Bridlington on Tour de Yorkshire day.
There will only be two return services between Scarborough and Bridlington all day on Friday, making it impossible to see the start of the race and then catch a train in time to see the finish.
Travelling to and from Hull will be less badly affected, with 11 journeys planned in each direction during the day.
Northern Rail has said it is only expecting to run 40% of its usual weekday services across the region, due to industrial action by RMT members.
It has warned passengers that trains will be busier than usual and they should give themselves extra time to travel and consider whether their journeys are necessary.
Sharon Keith, regional director for Northern, said: “To keep as many people on the move as possible, we are targeting available trains on our busiest routes and at peak times.
“The majority of trains will run between 7am and 7pm, with rail replacement buses on some routes where we unable to run trains. Customers need to plan carefully as services will start to wind down from late afternoon.
“To support day one of the Tour de Yorkshire, where possible, we are adding carriages to the services we are able to operate around Middlesbrough, Whitby and Bridlington.”