It definitely happened in Portland when they ran the Orange line. We were house-hunting a year or two before the new light rail opened, and realtors showing hou

It definitely happened in Portland when they ran the Orange line. We were house-hunting a year or two before the new light rail opened, and realtors showing houses along its route were already starting to make a point of mentioning it. As soon as it actually opened, neighborhoods that could use it suddenly got a lot more desirable (read: expensive).