Brian Redhead reports from the 'Rocket 150' event held at Rainhill, Lancashire to mark the 150th anniversary of the world's first inter-city railway and the Stephensons' legendary Rocket locomotive. On display are 'celebrity' engines from across the country, including the 'Green Arrow', the 'Flying Scotsman' and the record-breaking Mallard-class train that bore its designer's name, 'Sir Nigel Gresley', as well as the king of the modern electric railway, the Advanced Passenger Train (APT).