On Monday, we posted our twenty-fourth photo challenge to see how well you know Metro. I took photos of five Metro stations. Here are the answers. How well did you do?

This week, we got just 15 guesses. Two people got all 5 correct. Great work, Peter K and Chris.

Image 1: Union Station

The first image shows the Massachusetts Avenue entrance to Union Station Metro. The distinctive feature here is the central entrance between the escalators. The escalators lead up to the portico of Union Station. The central passage goes directly into the lower level food court of the station. One commenter noted that the steps seem to be an ADA violation, but since this mezzanine doesn’t have an elevator, it’s not an issue.

With 14 guesses, all but one of you knew this was Union Station. It was, by far, the most recognized image this week.

Image 2: Wiehle Avenue

This image shows the art in the north entrance plaza at Wiehle Avenue station. The building under construction in the background is part of the TOD growing around the new Metro stop. Several of you guessed NoMa or Navy Yard, which also are seeing new construction. But the art here is the clue. Only five of you got this one right.

Image 3: Georgia Avenue/Petworth

The third image shows a public art installation at Georgia Avenue/Petworth station. I actually collected this photo for possible inclusion in Week 4’s art set, but it didn’t make the cut. This art is just outside the faregates, and greets customers as they turn from the entrance corridor into the train room. With only two correct guesses, this image was the hardest this week.

Image 4: McLean

This image proved to be a little trickier. It shows the new Silver Line viaduct approaching McLean station. The picture was taken from the entrance to the north side of Route 123. The primary clue here is the watercourse, Scott’s Run. The other clue is the light color of the concrete, which distinguishes it as new construction. Five people correctly guessed McLean.

Image 5: Greenbelt

The final image depicts a pair of old B&O Railroad “CPL” signals from the platform at Greenbelt. These signals are very distinctive, and were unique to the Baltimore and Ohio Railroad (the MARC Brunswick and Camden lines run on former B&O lines). Unfortunately for fans of the historic signals, the congressional mandate for Positive Train Control means CSX is currently replacing all their CPLs with a “Darth Vaders.” These signals guard the ends of the station tracks at Greenbelt MARC. It’s the last place in the Metro system where you can see a CPL from a platform. Seven of you got this one right.

Next Monday we’ll have five more photos for you to identify. Thanks for playing!

Matt Johnson has lived in the Washington area since 2007. He has a Master’s in Planning from the University of Maryland and a BS in Public Policy from Georgia Tech. He lives in Dupont Circle. He’s a member of the American Institute of Certified Planners, and is an employee of the Montgomery County Department of Transportation. His views are his own and do not represent those of his employer.