A forecast of high winds and freezing temperatures prompted SEPTA to announce a reduced schedule for Regional Rail on Friday.
"We don't want people to get stranded in too many vehicles if we have issues tomorrow," Jeff Knueppel, SEPTA's general manager, said Thursday.
The concern is the effect the wind and cold might have on railroad operations. High winds can knock down power lines and blow snow into the motors of some SEPTA trains. Snow and freezing temperatures can also cause switches, which route trains from one track onto another, to fail to align properly.
The combination of potential pitfalls made putting fewer trains on the tracks seem prudent, Knueppel said. "It's going to be dangerous conditions tomorrow," he said.
SEPTA will have backup buses on hand if trains become disabled.