SEPTA officials say they understand Regional Rail riders' frustrations after another rough day for commuters in Philadelphia 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.

Thousands of Regional Rail riders have rolled with the punches, dealing with weeks of delays, cancellations and crowded trains.

"It's just unpr

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