The Leighton Buzzard Railway is moving into the 21st century by replacing flagmen with flashing colour light signals. Flagging a train on the Leighton Buzzard Railway in 1977. The project to replace flags with flashing light traffic signals has been prompted by a recent safety review by the Office of Road & Rail (ORR). Following that review, the railway has started a project to replace the omnipresent flagmen with flashing colour light signals. Flagging a train on the Leighton Buzzard Railway in 1982.