this is enough proof for me to believe there is a B bus for night time, i mean, how much more proof do you need? It's BLATENTLY obvious it exists, from all the hints they've given us about it, how can you NOT believe it?
ride the B Bus, bus route times, day x2 me, rez saying there is more, the presence of the nav card table whose purpose is undiscovered as of now, clocks being 10 min till 8:00, etc.
there is a sign in the tunnel between the terminal and the diner that says day x2me sorta looks like day time. you can read it when riding the bus at it pases by the sign