After years of planning, Detroit‘s M-1 Rail Line took an important step into physical reality this week, as piles of 80-foot-long, 3,000-pound rails arrived on construction sites that will build the 3.3 mile streetcar line by the end of 2016.

Streetcars in Detroit made their final run in 1956, but the new $140 million public-private infrastructure project could renew public transit in the Motor City. It’s a small stretch of rail in the context of Detroit’s massive urban footprint and widespread depopulation, but despite the system’s shortcomings, some see M-1 as a reason to be optimistic about the city’s future. Others say it’s a boondoggle.

At 3.3 miles long, the line will include 12 stops along Woodward Avenue, connecting pockets of development in Downtown and Midtown. It was originally intended to be almost 10 miles long. If the M-1 catalyzes development in the area, as its supporters predict, it’s possible there would be an extension of the rail line.

Rides are expected to begin by late 2016, around the same time as portions of an ambitious plan to attract development with cultural destinations and a new Red Wings arena.

Meanwhile Detroit-based construction firm Farrow Group is already at work laying the rails, which arrived earlier this week from an Indiana factory of L.B. Foster Co.