Submitted by Bob Hay, who says:

Here’s a photo I took on the Baltimore Metro. It’s a glass partition with system map showing connections to Light Rail and MARC as well as the Metro subway line. I don’t recall ever seeing a map displayed on glass like this. (Sorry the photo isn’t clearer, but my stop was approaching.)

Transit Maps says:

While maps on glass partitions are unusual, they’re not unique to Baltimore. Off the top of my head, I know that the Stockholm Metro does it, and I feel sure that my readers can come up with more examples. I do always wonder about people trying to read the map in reverse when they’re on the “wrong” side of the glass, but I guess for a simple system like this it shouldn’t present too much of a problem.

The map itself looks like a modified version of the Bus and Rail Connections map (PDF) available on the Maryland Transit Administration’s website, complete with colour photos of the trains to help you tell the difference between a subway/light rail/MARC train (just in case).