A campaign group has been handing out leaflets outside the annual Direct Rail Services open day, criticising the company.
Radiation Free Lakeland are concerned tonnes of radioactive materials will be moved along the railway lines if a new power station is built at Moorside in West Cumbria:
They're calling it a 20-year celebration, and we're saying, are you really celebrating 20 years of bringing radioactive waste into Sellafield by train?"
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