The segment that will be completed in June is a mere 1,300 feet in length, but the Friends of the Rail Park has always envisioned something much more ambitious. Their master plan calls for a three-mile trail that will loop around the northern rim of Center City, allowing people to walk from the viaduct's terminus at Ninth and Fairmount, west to 31st and Girard. If the group can pull it off, the completed Rail Park could help connect a string of neighborhoods between Chinatown and Brewerytown, and provide a green escape for their residents. But they will have to raise vast sums of money to make the bigger park a reality, well over $100 million.