Larry
It seems we are not the only ones to suffer Heljan's lack of quality control though to have both Large Prairie and Mogul give problems seems like a double dose of bad luck. I have been running various locos around the outer oval of my new Moor Street Station Layout and I must say that the Tower Brass Ivatt 2MT is very reliable. Also, the two Minerva Panniers perform well, though one had a tendency to stall on the Marcway scissors where no other engine faltered. A bit of emery paper on the switch blade seems to have cured that little problem. I am reluctant to say anything about the Heljan Large Prairie lest I jinx it, but fingers crossed. Ironically my best performer is one I built, the MOK 14XX and I don't think I am being kind to the little tank engine; it's like a Timex, it takes a licking and keeps on ticking!
The Lee Marsh Jubilee does what it should do though the sound files are in need of an upgrade which I hope to get installed this summer. I am looking forward to the Lee Marsh Castle arriving on Platform 7 (Snow Hill, that is) with the Cornishman before crossing town in the tunnel and speeding southwest past Moor Street.
Like others before and after, it will be sad to learn that Carrog is being lifted, but that's progress. It has been a revelation to many of us of how to build a good prototype based model.
Paul