as i arrive, the north york moors railway has only been open a couple of days after months of lockdowng to the stationmaster, and he travels 100 miles to work on this line, and he's a volunteer, he does it for free. so it's just... it makes it feel even more special that it's back up and running again. we need this, they all need this. it takes £7 million a year to keep this running. you put it here? marvellous. and when you come face—to—face with the guys trying to keep the wheels on the rails, you really understand the colossal effort, and expense. so i just light the flare, and what i want you to do is just have a look inside that hole inside the boiler there, and just make sure there is no lumps of scale and sludge, and make sure all the passageways are nice and clear. mate, it seems all clear in there, i think there's something, some brown stuff on the left, on the left—hand side. we have to do this every 28 days, to wash the boiler out, and there's nearly 50 of these plugs on the engine. 50! and we have got to remove each plug, wash out, we have to check inside with the flare and