Hi, I've been playing TTDP for years, but only recently I found about PBS, so I don't fully understand how they work. From what I understand, the white signals allow a train to pass (quote from the manual: "Hence they should be used where trains should pass through in one direction, and possibly wait in the other."). The train should go up, but it stoped there, though there is no train in that intersection. I tried using a two-way signal, but it is converted automatically to PBS signal and the train passes it when it enters the intersection, but cannot pass the signal when it goes up.
Edit: I'm using the latest nightly(r2079). All signals related options in ttdpatch.cfg( isignals, pathbasedsignalling, presignals, psignals, tsignals) are on.