Ok, ok - so I led with my chin.
Dong has kindly corrected himself correcting me. For your undoubted delight and delectation here's the full unexpurgated new comment in pure Dongalese.
Once again it gives me a decent excuse to publish a shot of our day trip riding the steam. This is the loco that pulled us on the outward journey; a shot taken by Mrs The Millbrooker from within our compartment. It is definitely NOT a Black 5, perish the very thought. Even though it's black and goes chuff-chuff, it's not of the five variety.This is Dong's new comment; I wish everyone well in maintaining their will to live throughout the next few paragraphs:
"A further update is required as I have led you astray in referring to loco number 42968, featured in your photo and the motive power on the run back from Bridgenorth to Kidderminster (shed code 84G) as a black 5.
Similar to the black 5 in that both classes are classified as 5MT (mixed traffic) this locomotive class was introduced in 1933 as opposed to the black 5 which was introduced in 1934, both designed by William A.Stanier FRS and sharing certain characteristics, boiler pressure of 225 lbs per square inch for example, I believe that they share the same boiler design - LMS tapered inspired by the GWR tapered as mentioned before.
There are however two major differences between the classes, our loco has driving wheels of 5'6"diameter whereas the black 5 has 6' diameter driving wheels and - crucially from an identification point of view - has a 2 6 0 wheel arrangement rather than the 4 6 0 classic British wheel arrangement of this black 5.
So there you have it, similar design, same designer, easy mistake to make as 840 black 5's were produced compared to only 40 of our locomotive class but I do apologise for inadvertently misleading you.
As I have mentioned before Duffel coats were our uniform of choice in those far off salad days, anoraks being a comparatively recent innovation."