By Emma Revell Slow, crowded and expensive, there’s no doubt our railways need a major overhaul – but it’s far from clear that Great British Railways is the answer, says Emma Revell One of the many delightful quirks of our democracy is the State Opening of Parliament, where the government’s legislative agenda for the coming session is set out by the monarch from a gold throne wearing heavy robes and a shiny crown. For me, nothing will beat the totally incongruous sight of the late Queen Elizabeth II uttering the words “plastic carrier bags” back in 2014, when Cameron and co decided a 5p levy w…