Works behind schedule; costs going up; an inquiry into poor performance announced by the industry regulator. It's a depressingly familiar story on our railways. From brand new station escalators at a standstill in Birmingham, to only 10 per cent of trains on time at one of London's busiest stations, even the Chancellor's planned Northern Powerhouse is threatened as line upgrades between Manchester and York are delayed. Allan Urry investigates Network Rail's woes as pressure mounts to deliver £24 billion of infrastructure improvements. Reporter: Allan Urry Producer: Rob Cave.