Philadelphia and Harrisburg remained until 2014. In July 1999, PennDOT budgeted $9 million for this project to eliminate the three remaining crossings; however, these funds were later used for other projects. One of the crossings was in Elizabethtown and another in Mount Joy. The third, between Mount Joy and Lancaster, was blocked off using fencing and jersey barriers. Additional funding from the American Recovery and Reinvestment Act of 2009 was used to complete the elimination of all at-grade crossings. The last was closed in 2014. Private crossings remain between Philadelphia and Harrisburg. There are still grade crossings between Harrisburg and Pittsburgh. Earlier studies There have been earlier studies by the USDOT and FRA of the Keystone Corridor, and these studies contain proposals or speculations which might not be in the currently funded projects. Some of these ideas are below. Amtrak service to Suburban Station, which is in Center City Philadelphia, ended in 1988. An early study says that PennDOT used Suburban Station as the Philadelphia endpoint for the 90-minute service to Harrisburg. Restoring service to Suburban Station may increase ridership but would require using the upper level of 30th Street Station and either scheduling trains to turn at Suburban Station or to continue through the Center City Commuter Tunnel (with Amtrak trains turning around at Wayne Junction). Bypassing 30th Street Station by using the New York-Pittsburgh Subway would allow trains to skip a time-consuming stop and reverse of directions at 30th St Station and allow fast service between New York and Harrisburg. Historically, the PRR fast trains going to NY from the west would bypass 30th St Station, and passengers for Philadelphia would change trains at North Philadelphia. One study suggested two daily electric-train round-trips between New York and Harrisburg with stops in North Philadelphia and Ardmore, a routing last used by Keystone trains in 1994. Track reconfiguration between Zoo and Overbrook interlockings can increase track speeds which are usually due to the need to take diverging routes through switches. Reducing the number of diverging moves and the use of switches can increase speeds. Also, the reconfiguration can allow for the removal of the overhead bridge that the R6 Cynwyd trains use. Some other interlockings may be removed or reconfigured. With the reconfiguration near Zoo, the Overbrook interlocking can be removed and replaced with 4 through tracks. Bryn Mawr interlocking may have storage tracks added west of the station to