General Discussion

Hi, new to live steam something I have wanted since there release, now the children are adults I treated my self to a brand new Mallard and a once used Flying Scotsman, I have followed the videos and advice and had no problems having the Flying Scotsman work, how ever I would like to pick your brains please. I have run it on a rolling road and the advice is to wait for the pressure release valve to let steam out so you know ready to go, however this didn't and doesn't happen but still runs but while waiting for steam instead of through presure release it seems to steam under the locomotive with what sounds like some one trumping and spits steam? I can not find any advice on this? Is this normal after so long not in use and will loosen or do I have a pressure release issue. Many thanks for any advice .Wayne