UPDATED: 2022 09 11 The repeaters that were formerly AWS Virginia (Northern VA DMR) have now joined the Interstate system. This adds 7 repeaters, in Herndon (2m, 70cm & 33cm), Vienna (2m, 70cm & 33cm) and Arlington (70cm).
The “local” TG-2 cluster is all these repeaters in DC, MD and VA (21 repeaters).
As with other repeaters on the Interstate network TG-9 (9-1 is TS-1 and 9-2 is TS-2) are local to that repeater (they may be cross-linked on the Herndon and Vienna repeaters, I haven’t confirmed this yet).
The W-B cluster carries MD and VA statewide full time on TS-1