The major element was the replacement of rails on the Queens Boulevard viaduct. This was necessitated because the subway was allowed to deteriorate during the 1970s and 1980s to the point that there were widespread "Code Red" defects on the Flushing Line, and there were some pillars holding elevated structures that were so shaky that trains would not run if the wind exceeded 65 mph. <7> express service was suspended for the duration of the project; however, extra 7 service was provided for Mets games and Flushing Meadows Park events. During the project, delays of up to 10 minutes on weekdays, and 20 minutes on weekends were expected. The New York City Transit Authority (NYCTA) had considered running express bus service to replace <7> express service, but decided against it as it would require hundreds of buses, which the NYCTA did not have. During the construction project, the NYCTA operated 25 trains per hour on the local track, three fewer than the 28 trains per hour split between the local and express beforehand. Running times on the 7 were lengthened by ten minutes during the project.