Big City Engine is a tender engine from The Other Railway built at Crewe in May 1934.
Big City Engine once stayed the night at Vicarstown with Gordon and Duck. The three engines were involved in an argument about the confusion between the mainline stations in London. Gordon remembered a trip to King's Cross in his youth, and believed that London was restricted to Kings Cross. Duck thought that London was Paddington, as he had once worked there. Big City Engine thought that London was Euston.
Unknown to them, they were all correct, as there were a number of stations in London for different railway companies. Even so, Gordon and Duck still continued the argument when the engine went away. Because of this, Gordon was eager to find out, but he was most disappointed to discover when he visited London that the station he visited was St. Pancras.