Hi kws400,
I can't speak for all of these things, but I can say that some British railways 9F locomotives were fitted with a mechanical stoker.
Here's a section from Wikipedia about the 9F's that you might find useful:
"Locomotive numbers 92165-92167 were built with a mechanical stoker, which was a helical screw that conveyed coal from the tender to the firebox. The stoker made higher steaming rates possible, and it was hoped that mechanical stoking might enable the burning of low-grade coal. It was relatively inefficient, and the locomotives used in this trial were rebuilt to the normal configuration Simply supplying more low grade coal than a fireman could do by hand did not provide efficient burning.
Number 92250 was equipped with a Giesl ejector in which the exhaust steam was divided between seven nozzles arranged in a row on the locomotive's longitudinal axis and directed into a narrow fan-shaped ejector that more intimately mixed it with the smokebox gases than is the case of an ordinary chimney. This offered the same level of draught for a reduced level of exhaust back-pressure or, alternatively, increased draught with no performance loss elsewhere. Again, great claims were made as to the potential benefits, and 92250 retained the variant chimney until withdrawal, though no benefit was noticeable.
The only modification which did deliver any noticeable benefit was the fitting of 92178 with a double blastpipe and chimney during its construction. Following delivery in September 1957, it was subjected to extensive testing, both in the Rugby test plant and on service trains. After the completion of the tests in February 1958, it was decided to fit all 9Fs built subsequently with double blastpipes and chimneys; these were numbers 92183 onwards, also 92165–7. The modification was also installed on 92000/1/2/5 and 92006. This allowed the engines to steam slightly more freely and thus generate higher power ranges."
Other 'Standards' were fitted with roller bearings.
http://thisisnotawebsite.itswordpress.com.au/blog/
That's a website I made for a school assignment. It has info on BR's 'Standard' steam locomotives. You might find some info on which of those locos had any of the features you listed.
I'll leave it to somebody else to tell the facts about the Big Four and its predecessors.
Kieran.