made by IMAX cameras, 35 mm and 70 mm cameras had to be used for shooting the film's dialogue scenes, as dialogue had to be dubbed when shot with IMAX cameras. Chairman and president of the IMAX Corporation Greg Foster stated that IMAX planned to run the film in its theatres for two months, despite only being contractually committed to run the film for two weeks. Nolan also bypassed the use of a digital intermediate for the film, resulting in less manipulation of the filmed image and higher film resolution. Filming was scheduled to start in May and conclude in November 2011. Principal photography commenced on May 6, 2011, in Jodhpur, India, at the Mehrangarh Fort before moving to Pittsburgh, where it operated under the working title Magnus Rex to reduce the visibility of the production. Shooting locations within the city included Heinz Field, the site of an American football game, with members of the Pittsburgh Steelers playing the Gotham Rogues football team. More than 11,000 extras were used to depict the shot sequence. Filming in Pittsburgh also took place at the Mellon Institute and Software Engineering Institute at Carnegie Mellon University. A letter sent out to residents and business owners detailing road closures revealed that the streets of the city would be featured "as the start of [the] film". 9-1-1 operators were told to expect an increase in calls related to gunshots and explosions in the film's production. The Pittsburgh leg of production wrapped after three weeks on August 21, 2011. The next portion of the filming began in Los Angeles in late August and finished up on October 23 after nine weeks of filming. New York and New Jersey were the next places of filming. The Trump Tower replaced the Richard J. Daley Center as the location for the headquarters of Wayne Enterprises. In November 2011, shooting shifted to Newark, New Jersey. Newark City Hall and Military Park were among the locations used for filming. Other shooting locations include London and Glasgow, the latter of which was used for "additional exterior filming". Principal photography concluded on November 14, 2011. The external waterfall scene at the end of the film was shot at Sgwd Henrhyd falls, on the edge of the Brecon Beacons National Park in Wales. Production photos from filming in Pittsburgh showed a second Tumbler chassis after the first was destroyed, indicating that a new Batmobile would