Scotrail has 320320

If you go back to precovid timetable basically every service came from/went to Stranraer and it ran every 2 hours up till 11 at night, there was also a few extra services at peak which made it hourly although those only came from/went as far as Girvan

Should really be an hourly service from Kilmarnock to Girvan or at least Ayr, could see it becoming more frequent when the line get its knitting

Funny enough 504 would of done a Stranraer service about 10 minutes after detaching at Kilmarnock. There are also 1 (thecnically 3) services a day that do that, one service in the morning does it on 1 headcode the other 2 do it right after they arrive at Kilmarnock.

saw it yesterday when I was at Carlisle, nice surprise to see as well as only a few minutes before that 390119 was in the station

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Exact same happened to me when I joined although after following people it has somewhat declined thankfully