CNG Gas powered New Flyer C40LF, 2302, seen in August 2010 on the X2, was third in a batch of 100 such buses, 2300-2399, delivered in 2001 and all retired in 2016.
Another of the batch, 2315, on the more mundane line 80.
Heading to the oddly named Farragut Square on the G8 is C40LF 2331.
The Stadium Armory is the destination for C40LF 2327 on the D6.
Heading in the opposite direction on the D6 to Sibley Hospital is 2367.