 The huge escalator linking this World with the Other, called  "Operation Ethel" by the firm of engineers who constructed her under  the aegis of the London Passenger Transport Board, took three months  to make and cost 3,000 pounds (in 1946). "Ethel" had 106 steps each  20 feet wide and was driven by a 12 h.p. engine. The full shot was  completed by hanging miniatures.