Re: D&RGW T-12 Folio Drawings

I can't help but notice the domes and sand boxes in the drawings. The class 47 (later, T-12) machines were ordered with rounded cast domes and sand boxes; the two survivors carry them to this day. The earlier class 45½ ten-wheelers and most of the consolidations had the old-style fluted domes, of course. Do I detect a bit of corner-cutting in the preparation of the drawings? I surmise whoever made these drawings might've saved work by tracing detail components from some master source. It wouldn't make sense to draw those domes from scratch if the class never carried them (and I've not personally seen photos of them with 'em, though temporary retrofits are of course at least possible) since the old-style domes take more work to draw than the post-1882 domes the class is normally associated with.

Tractive effort suggests a 145 pound boiler pressure in the first drawing, using a 46 inch driver diameter. They were delivered with 45 inch drivers (40 inch wheel centers in both cases) but apparently thicker replacement tires were used once the originals wore out. I don't understand why steam locomotive wheel diameters are always listed using a variable wear component (the tires) anyhow...much more sensible to list the wheel centers like we do with automobiles.