SEPTA says Regional Rail riders could face possible cancellations, delays and crowded trains over the next month after last week's federal emergency order required the transit agency to stop using some of its railcars due to fire risk .

Last week, the National Transportation Safety Board urged SEPTA to immediately stop using its Silverliner IV railcars because they pose a safety risk due to electrical fires that could spread. Then, the Federal Railroad Administration issued an emergency order that required SEPTA to take immediate action.

"SEPTA crews are performing enhanced safety inspections and removing rail cars from service proactively for further examination as needed," SEPTA said in a statement.

Riders faced delays, cancellations and crowded trains Monday, and SEPTA said i

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