The film concerns an attempt to steal £100,000 in gold from a train. After the opening credits, the following statement appears: 'The Producers wish to thank BRITISH RAILWAYS for their help and generous co-operation, at the same time acknowledging that the events depicted could not possibly happen." An emphatic contradiction came in 1963 when robbers stole £2,610,000 (about £45.4 million in 2023) from a train travelling from Glasgow to London.