Not OP but there’s an entrance to the W&OD trail around the corner from Wiehle Reston stop, it’s on wiehle Ave by the pupatella

Yes, it’s Wiehle Reston. The trail is super close. If you’re unfamiliar, use CityMapper app from there and ask it for directions via bicycle to your destination, and it always puts me on the W&OD. Iirc, I take my bike up via elevator, walk over the overpass then through the square with Founding Farmers, to Wiehle Ave on the other side of that square. Go left on Wiehle, past all the construction, and the trail is about a block or two away.

I just learned that the construction is to make it easier for pedestrians and cyclists to access the trail! https://www.fairfaxcounty.gov/transportation/projects/wiehle-wod-trail