A survivor has blamed suspected technical faults and the UK's ageing railway network for a devastating train crash that has left one driver dead and at least 33 people seriously injured.Passengers suffered broken bones and were left 'spitting out blood' when a Luton Airport Express service ploughed into the back of a stationary East Midlands Railway train at around 5.15pm on Friday.Some travellers reported being 'flung' from their seats into the chairs and tables in front, before seeing the carriages fill with smoke. Brett Byatt, a teacher from Bedford, who was travelling on one of the trains, said while yesterday he felt shocked, today his overwhelming emotion is 'anger'. He also questioned why a train driver had lost his life in the collision, adding that signal failures happen all the time on the UK's railway network. 'Yesterday I was pretty, like, shocked,' he said. 'This morning, it feels surreal, and I think I've moved into the stage of anger now. I'm feeling pretty angry.'He added: 'I don't know at whom, who specifically, but it's more about we've got one of the oldest railway networks and signal failures happen a lot, and now I'm just wondering… why wasn't that signalled to my train and why did that train driver lose his life over this?'Investigations are ongoing and there has been no official finding as to the cause of the crash. Passengers suffered broken bones and were left 'spitting out blood' when a Luton Airport Express service ploughed into the back of a stationary East Midlands Railway train A video taken inside one of the carriages after the crash shows panicked travellers lying on the floor and crying out for help A Luton Airport Express train crashed into a stationary train causing serious injuries and bloodied passengers on board Brett Byatt, a teacher from Bedford, questioned why a train driver had lost his life in the collision, adding that signal failures happen all the time on the UK's railway networkMr Byatt told the BBC that he thought 90 per cent of people on his carriage had serious injuries, could not stand or move their neck. Investigators are examining whether a fault with the stationary train's safety systems may have played a role in the crash. The system is designed to automatically apply the brakes if a driver fails to acknowledge an approaching red signal.It is understood the Luton Airport Express train collided with the East Midlands Railway service, while its driver was reporting the issue to maintenance staff by phone.A railway expert said today that investigators would 'already know' what happened in the Bedford rail crash from 'second by second' airline black box-style recorders in the trains.Tony Miles said they recorded 'every switch that was pressed and every control that was activated' in both trains.He also praised staff on the trains who were able to get off for 'acting very quickly to protect the railway' by 'laying wires across the adjacent tracks' to trigger a secondary signalling system in case the first one had failed.Mr Miles from Modern Railways magazine told the BBC the questions that will be asked are 'were the signals showing red and the train went past them or were the signals showing that the line was clear and, if so, how were they able to know when the train in front was stopped?'.'That should be impossible because as long as the track is occupied, it shouldn't be possible to clear the signals,' he explained.Mr Miles said that while a driver could theoretically make a decision to cross a red signal if he wanted to 'they would normally only do that because they had been given permission by a signal box because there was a fault'. Aerial image shows the aftermath of the train crash in Bedford yesterday afternoon Passengers suffered broken bones and were left 'spitting out blood' when a Luton Airport Express service ploughed into the back of a stationary East Midlands Railway train Injured passengers gather by the side of the tracks after two trains collided near Bedford last night