After the Huntingdon knife attack, transport experts are considering the future of rail passenger protection Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice “Passengers will see a high-visibility presence of officers at stations and on trains throughout today who are