All aboard! During the 1800s, when construction of the Philadelphia Zoo was reaching a feverish pitch, another fantastic invention was nearing completion: The transcontinental railroad. Finally, the developed eastern seaboard and the rough-and-tumble west would be linked. Today, our youngest visitors can share in the excitement of this grand accomplishment with a quaint ride on our very own SEPTA PZ Express, a charming but SEPTA-fied reminder of the Zoo's heritage. Valid SEPTA Pass holders receive $2 off SEPTA PZ Express tickets (up to 4 tickets) when they present their valid SEPTA TrailPass, TransPass, One Day Independence Pass, SEPTA Key or SEPTA Employee ID. Cannot be combined with another offer.