I'd be curious to know if there is coal dust all over the bedspread/suitcases. If she was in one of those mining areas as a worker, or spouse of worker, I'd think it would have been hard to NOT have dust on everything.
I was thinking that the letters and numbers couldn't have been anything to close by or LE would have figured it out at the time.
There was a train in some coal areas way out in south west PA that was named something like Waynesburg South Route - but it was a closed rail system and not connected to commuter rails or anything further than northern WV.
Maybe the WSR thing is in Tenn. IDK if anyone has looked there. I haven't.......until now!