Overnight service changes begin tonight on PATCO.

From midnight to 4:30 a.m. on weekdays, trains will run only once every two hours.

And, the Lindenwold and 8th and Market stations will be closed overnight for two weeks for cleaning and maintenance.

Then, beginning Sept. 1, overnight weekday service will be completely suspended and all stations will be closed overnight for six months.

However, there will be no changes to overnight weekend service.