John, as always your knowledge is immense!
I had a follow up question that occurred to me as I was riding the Silver Line yesterday past the tracks that lead to the Dulles railyard. Of the existing Metro railyards, which ones have the room to expand? I assume Dulles because it's surrounded by nothing, though maybe WMATA would need to buy more land from WMAA. The only other yard I am intimately familiar with is the one in Alexandria, and I know that's basically hemmed in on all sides now so it probably cannot grow any larger.
Within the existing yard footprints, the layout of these as built yards allowed additional tracks to be added:
- New Carrollton has room for 2 tracks between track 16 and Garden City Drive, 16 cars.
- Falls Church had its room used for the Annex Shop and 5 new tracks, 50 cars.
- Dulles has room for 2 track between track 16 and Rail Operation Drive, 30 cars .
- Shady Grove has room for 3 tracks between track 21 and the south loop track 1, 22 cars.
Most of the other yards are constrained to allow the addition of new storage tracks outside their existing footprints.
Greenbelt sacrificed tracks 17 and 18 to allow the building of the Acceptance and Commissioning facility.
WMATA has looked at placing new storage tracks inside the north loop at Shady Grove roughly 64 to 80 cars. They also have plans to add a 4 bay Service and Inspection Facility at Glenmont north of track 1.
With mitigation 4 tracks, 32 cars, could be added to Branch Avenue east of track 15 and 6 to 8 tracks, 48 to 60 cars could be added to Greenbelt with a ladder to the north on the east side of track 2.
John in the sand box of Maryland's eastern shore.