High-speed Keystone Service invitation, 2006.

Invitation to the inaugural run of new, electrified, high-speed service on the Keystone Corridor (Philadelphia-Harrisburg). Two sided paper bi-fold card, dated October 30, 2006. The Commonwealth of Pennsylvania and Amtrak announced the “Keystone Corridor Improvement Project” in 2004. The goal of the multi-year undertaking was to improve the 104 mile rail line in order to allow for all-electric train service, increase top speeds to 110 mph and add train frequencies including express options.