When railroad land goes up for sale, few are willing to buy it. The tracts are too thin for houses and too long for a single building. That’s why vacant lots such as the one between La Veta and Fairhaven avenues in Orange end up abandoned for so long. But the locals, as always, find a use. They’ve used the La Veta-Fairhaven tract for years as a trail for joggers and dog walkers. Kids with BMX bikes built ramps of packed earth and can be seen jumping in the air from local back yards. And though a private firm finally bought the land a few years ago and fenced it off, that didn’t stop folks from squeezing through the bars and adding fresh tags to the concrete walls.