It finally happened. After decades of planning, five years of construction, and months of delays, Washington D.C.'s brand-new Silver Metro line welcomed over 50,000 commuters for its opening weekend. The new 11.4-mile line, which includes five new stations, will ultimately connect the city to Dulles Airport in Virginia. That part of the line is scheduled to open in 2018. The Silver line, though, is more than an attempt to connect a city with its airport—it's the latest, multi-billion dollar effort to expand a rail system, spur economic development, and create more walkable, pedestrian-friendly destinations. So, yes, it's ambitious. And, yes, it was expensive. A host of local and national officials—including Transportation Secretary Anthony Foxx—were on hand this weekend to test out the new rails, which were first proposed in the early 1960s. Many of the excited commuters on their inaugural rides told local news crews that the Silver line will significantly cut down their commute time and may even allow them to ditch their car altogether. The Metro predicts there will be 50,000 daily riders on the Silver line by this time next year, and more than twice that by 2025 when the line is connected to Dulles Airport. Of course, building an entirely new rail line comes with significant costs (and significant delays and significant cost overruns). This first section of the project cost $2.9 billion, which is $150 million over budget, and opened six months late. All told, this first phase of the line cost nearly $47,000 a foot. The second phase is expected to cost $2.7 billion. About half of the total cost of the first phase came from increased tolls on the Dulles Toll road. The remaining half is a mix of funds from federal and local levels. In between DC and Dulles is Tysons Corner—an area in Virginia that's trying to shake its reputation as just a collection of shopping malls and office towers. That is no easy task, but the powerful interests in town see the opening of the Silver line as a crucial test of whether that's even possible. “There's not much riding on the Silver Line except the future of the American suburb as we know it,” CityLab recently declared. “A half-dozen Fortune 500 companies are based [in Tysons],” explained the site. “The area is rife with high-end hotels, restaurants, and department stores; there's even a Tesla dealership coming in. But grocery stores never arrived in any substantial numbers, nor did churches or parks or any of the other sorts of services that could help make a place feel like home for the roughly 19,000 people who live here now.” To achieve that, Tysons is planning new permanent green space, pop-up parks, new trees, overall streetscape improvements, and thousands of new apartments. A key element of the Silver line's planning seems to be perfectly aligned with that goal of a more walkable, urbanistic future. But it's not what the Silver line offers Tysons—rather what it doesn't: parking. The Washington Post reported that there are no parking garages at four of the five stations in Tysons. Walking or biking to one of these stations, though, appears to be a rather hellish experience, according to Ken Archer, who works at a software firm in Tysons."I've endured the lack of crosswalks in Tysons Corner for years as a pedestrian, but assumed that Fairfax County would add crosswalks before the Silver Line began operation," he wrote on the blog Greater Greater Washington. "The county needs to create safe pedestrian pathways immediately, rather than waiting until someone gets hurt or killed."