On Tuesday, we posted our sixty-fifth photo challenge to see how well you knew Metro. I took photos of five Metro stations. Here are the answers. How well did you do?

This week, we got 21 guesses. Six people got all five. Great work, Peter K, Justin…, Roger Bowles, AlexC, JamesDCane, and Mr. Johnson!

Image 1: Archives

This week had a theme: knockout panels. Each of the featured stations has provisions for future entrances. For each station, the image we featured is where slightly different walls make that visible.

The first image shows the knockout panel for a future southern entrance to Archives station (it would be in the vicinity of Constitution Avenue and 7th Street NW). This knockout panel is fairly distinctive because of the full outline of the mezzanine opening in the endwall of the station. The mushroom-shaped panel is easily visible from the platform. Note, the white rectangle extending outward from the wall has nothing to do with the panel. It’s part of an antenna for providing cellular coverage in the station.

Thirteen got this one right.

Image 2: Federal Triangle

The second image shows the provision for a future entrance to Federal Triangle station. Unlike at Archives, this future entrance would make use of the current mezzanine, and would not require a new fare control area. This entrance was planned at a time when the federal government intended to tear down the Old Post Office to complete the long-planned Federal Triangle complex. Since the building is landmarked, this entrance is unlikley to ever be constructed.

We featured this knockout panel in week 6. Only a few stations have knockout panels. You could’ve narrowed this down to Federal Triangle because of the elevator here. The only similar knockout panel is at Navy Yard (pictured below), and that knockout panel is not located next to an elevator.

Nine knew this one.

Image 3: Pentagon City

The third image shows the place where a future southern mezzanine could be installed at Pentagon City. Like at Archives, this would be a completely new entrance, with its own fare control. The main clue here is the orientation of the station. There are very few side platform stations in Metro, and even fewer have the waffle-style vault. So that should have helped you narrow down the options pretty significantly.

We featured these knockout panels in week 12. Eleven guessed Pentagon City.

Image 4: Navy Yard

The fourth image shows one of the knockout panels (yes, there’s more than one) at Navy Yard station. This entrance would lead to an escalator at the corner on the north side of M Street at Half Street SE. Originally, fare control at the western entrance of Navy Yard was at the mezzanine level (where the picture was taken), however, when this entrance was reconstructed to accommodate crowds coming from Nationals Park, fare control was moved to street level. If this entrance were built, the faregates would need to be at street level as well.

Clues for figuring this one out included the jagged area on the bottom of the panel (for structural supports) and the fact that you could see a second mezzanine at the opposite end of the station. Very few underground stations have entrances at opposite ends of the trainroom. So that should have helped a lot.

Nine figured it out.

Image 5: Bethesda

The final image shows the well-disguised knockout panels at the southern end of Bethesda station. These panels will soon be used to build a southern mezzanine with a connection to the Purple Line station just below the surface.

Other than having noticed these before, or having figured out the theme, the only thing you could do to narrow this down was to note the architectural type. This was clearly an Arch I station, a type which appears only on the Red Line’s Shady Grove branch. You can tell this is Arch I (4 coffer vault) because the first crossbar is very high on the wall. At an Arch II station, like Georgia Avenue, the first crossbar would be lower, and a second would be visible above.

Fifteen guessed Bethesda.

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

Note: You can find the leaderboard, submission guidelines, and other information at http://ggwash.org/whichwmata.

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.