The scheduled passenger flight was dispatched with 15 degrees flap takeoff performance data for Runway 10/28, which was 9,228 feet long. Takeoff actually was from Runway 19, which was 7,000 feet long. The airplane lifted from the surface in the safety area of the departure end of the runway and the left main landing gear struck a lighting control box for the rail system. A portion of the landing gear scupper separated from the airplane. The flight continued to its destination and landed without further incident. Prior to departure, the flight engineer filled in his portion of the takeoff data sheet and handed it to the captain. The captain anticipated that Runway 10 would be the departure runway and he performed takeoff data calculations using Runway 10 data. ATIS information and taxi clearance called for takeoff on Runway 19. The operator's procedures did not assign takeoff data calculations to a specific crew member. Procedures also did not call for verification of such information by other crew.