[32. 'Leave perfection to God and Iain Rice'; or, the futility of expecting flawless brick-work.]

I'd suggest taking a look at Physicsman's  thread, 

  because it goes into quite some depth about building a viaduct (and walls...) out of DAS over plywood.  (please ignore the image presented ^, no-one seems to know where it came from, not even Andy Y !)

 

[Scaling new heights; plumbing new depths – a maximum and minimum for a operating a model locomotive.]

The "stock images" of the South African gold mines show NG railway line- but I have no real idea how deep they are at.  I don't know how deep the connection between Quirke 1 & 2 was- knowing EL mines, it could have been anything over about 2' deep.  Underground operations weren't taxed, surface was...

 

Stanleigh Mine, which I went into 2x, went to 3600', but was rubber wheel when I was down it (and I didn't have any models with me...).  Stinko in Sudbury is fairly deep too- and also was fairly rail based into the 90's.  I think it has mostly gone over to tyre based equipment though.  (& is operated as deep as 5700')

[Scaling new heights; plumbing new depths – a maximum and minimum for a operating a model locomotive.]

The CO of one of the Upholder class boats was a modeler- as has been at least one CERA of them in Canadian service.  No, I don't know if they have run trains at deeper than 1200 ft.  (being a skimmer puke).  Of course, some real stock has likely been deeper, in the form of narrow gauge mine stock...

No idea on higher altitude than yours though- and I don't know anyone with the kit to try off hand...

 

James
 

[Building 'Tantalus' - Part Three]

On 02/05/2020 at 10:50, Florence Locomotive Works said:

I remember one of those steam wagons in the Liverpool Museum when I visited family there about 7 years ago. My 7 year old mind though it was the coolest thing ever. I believe they were all super sentinels, with fully enclosed undertype engines and vertical boilers, some capable of 50 mph.

The one closest the camera is the one my grand-dad bought and had restored in 1959.  Yes, those ones were Super's, but there were some of all the Sentinel products still around at that point.  One of the largest by # of late fleets was of standard (pre 1921) waggons used in a steel mill.