SEPTA is changing operations on the Market-Frankford Line and several Regional Rail lines.

This weekend and on May 12-13 and May 26-27, Market-Frankford trains will operate between the 69th Street Terminal and the Frankford Transportation Center. Shuttle buses will operate May 18-21, as they have during the construction on the line.

On the R5 Paoli/Thorndale line, construction between the Paoli and Overbrook stations will lengthen travel times for seven months beginning Monday. New schedules are posted at stations and SEPTA's Web site, www.septa.org.

Schedules will also change on the R2 Wilmington/Newark line and the R3 West Trenton line. Passengers may call SEPTA customer service at 215-580-7800 for schedule information. - Paul Nussbaum