That looks really good. Especially the first tunnelshot. I think that's the first shot i've seen where the tunnel is really dark, just the way it should be below ground.
There are some good subwaystuff on the DLS, but all tunnels, stations an such are WAY to bright for my taste.
One got to keep in mind that below ground the sun don't shine, with the exeption being Trainz.
So all textures need to be made really dark to compensate for that. I wish there was a way to turn off all suneffects on an object, but I don't think there is.