I really wonder what's the difference between one way signal and one way Path signal. I know they're not the same but my trains work with both of them. Also, building one way signal is slightly harder than building the path one.
What’s the difference between One-Way Signal and One-Way Path Signal
openttd
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Best Answer
One-way signals reserve a signal block between it and the next signal.
One-way path signals reserve an individual path between it and the next signal. This allows 2 trains to be on the same signal block at the same time, so long as they have paths that don't cross.
From the wiki:
For straight track and basic merges/splits, I stick to normal one-way signals. I use path signals for forks that have 4 or more tracks, as this is where they start to benefit.
Path signals also can behave similar to entry/exit signals, although entry/exit signals have uses that path can't fully achieve. For instance, entry/exit signals will cause trains to take longer routes if a path is blocked, while path signals may wait. This can be used to construct balancers and other helpful constructs.