Seoul Metro Line 9 will run more express trains during the morning rush and pilot four express bus routes connecting outlying districts with the city center starting Nov. 16, city officials said Wednesday. Line 9, which cuts through key commercial and financial districts, remains one of Seoul’s most notoriously overcrowded transit corridors. During peak morning hours, its express trains routinely carry up to 192.5 percent of their rated passenger capacity. Korea measures subway congestion relative to a train’s total design threshold, including standing commuters, meaning 100 percent represents a fully loaded train. To alleviate the problem, the city will alter the operational ratio of express to all-stop trains based on commuter demand for the first time since the line opened. From 5:40 a.m. to 7 a.m., eastbound service will run two express trains for every all-stop train, replacing the current one-to-one alternating schedule. Additionally, the municipal government is moving peak hour schedules earlier. Morning express service will begin at 5:40 am instead of 6:30 am, while evening