SEPTA officials say they understand Regional Rail riders' frustrations after another rough morning Thursday.

Signal issues brought the system to its knees right as the morning rush hour was beginning. On multiple lines, including the Fox Chase Line, Chestnut Hill West Line and Airport line, early morning trains inbound to Center City were canceled. Delays of up to 30 minutes were also reported across the rest of the system — causing a "cascade effect" of problems, officials said.

SEPTA Regional Rail was already experiencing disruptions and cancellations due to the ongoing inspection work on Silverliner IV railcars.

The Federal Railroad Administration ordered SEPTA to inspect all of the railcars following five fires on the model since February . Federal officials initially ga

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