Next time you’re riding the Red Line from Central Square to Harvard station, spy a piece of transportation history. Just as the brakes start to screech, look closely on the right side: You’ll see the ghostly remains of the old platform east of the current Harvard station. The station was closed after the Alewife extension opened in the early 80s. You can also catch a glimpse of the now defunct Harvard-Holyoke station, on the right side of inbound trains, just after leaving Harvard station.

The cavernous tunnel seen here was the old terminus underneath Brattle Street. Mark Marcarelli, left, a project superintendent with O'Connor Company, and Pat Hynes, a mechanical engineer with the T, survey the area.