alt Hacker News>This combo lets you set up an upline and downline with a terminal station:
That actually is nothing to do with path based signals, and could be done quite simply with purely vanilla TTD signals.
What path-based signaling allows is for multiple trains to make non-conflicting moves through a single block at the same time, which basic signals wouldn't.
That's not quite true. The original signals would let a train into the cross over block when no station lines were available because they didn't have that pass through. Depending on the layout it would either get stuck or end up heading in the wrong direction. Pre-signals could solve it but they weren't in the original.