As far as I know the NP/BN station in Pasco didn't have anything when we left in 1978. If there was anything, it wasn't labeled, and would have been just a faded white line. But I don't remember anything.
The "station track" was very seldom used for anything except passenger trains, especially after Amtrak, and all of the trains stopped there. So, if there were any people too close to the tracks, they had plenty of time to get out of the way. Not like some stations where freight trains blew through without slowing.
I have no idea what the "new" Amtrak/bus station has, as I've only been there a couple times, and never looked at the platform.