I"m not sure what you mean by a “correct” train since all the models you mention are freelanced, the Chaloner being closest to its namesake in my opinion. Chaloner worked from 1877 to 1955 in slate quarrys and mills, with numerous rebuildings of course, quite a service record. It has been magnificently restored and runs today at Leighton Buzzard. The beautiful book, “De Winton of Caernarfon”, tells the story.
I believe Mike is asking since he is trying to decide between a Sammie and Regner’s new Henry, which he has ordered. The pictures of Henry show it to look like a Willi chassis with logging type bodywork. The specs I’ve been able to find show Willi to be slightly smaller than Henry probably because of the wood body. The major difference is Willi’s boiler is listed as 130mm while Henry’s is 110 ml. Willi is listed as having a 20 min run time, I could not find that statistic for Henry.
My personal experience stems from a Willi I bashed for a Steam In The Garden contest in 2006 and with which I can easily achieve a 30 minute plus run time. I usually haul two Accucraft 4-wheel flats with wood loads or several LGB gable dump cars. I have not owned a Sammie but my late friend Don Sauer ran his frequently resulting in run times over 30 minutes as well. Sammie’s “secret” is under the saddle tank where the boiler markedly increases in diameter compared to the size of the smokebox.
Peter Thornton can probably chime in with his opinions on Chaloner. Dave Frediani’s Brunel (the only one I’ve seen) ran well at Diamondhead but I don’t know for how long.
On an early page of Mike’s thread on MLS I opined the he should get a Sammie. I stand behind that suggestion though I do love my Regners. I wish he’d make up his mind and get something so he can enjoy live steaming.