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Geeves That sounds like it. So its a mod on the after cooler. You say the after cooler is the pipes, do you mean that 'helter skelter' of tubing in the bottom photos?

Its defo not the compressor governor. Both vehicles, two distinct sounds pef vehicle at the same time 455driver. Yes it was stationary. Do 455s have a similar system? I know a lot of DMUs have norgren filter systems on their air system, but that doesn't drain every couple of minutes.

It seemed to be coming from both vehicles, within a second or two of each other, as if it was supposed to be doing it, like on a timer

Hello I asked 2 questions in the timetables section about a Carlisle a Glasgow service I saw at Carlisle yesterday. The 2nd question is probably more relevant here. The Scotrail class 156 made a noise every couple of minutes like several air valves firing, and then again a few seconds...

Thanks Adam Yes it was Central. I don't even know where I got Queen st from. Thanks for the reply. I suppose I should move my post to find out about the strange noises it was making

Hello First post so I hope I am in the right bit. At Carlisle station this evening waiting to wave a friend off on a pendolino to Birmingham i noticed a ScotRail Class156 on platform 4. The boards said it was the 19:17 to Glasgow queen street. However the timetable stated that was operated by...