Enjoyed that, I knew the very last shunting horses were at Newmarket.
In the old book I have "Behind the Lines" there are several anecdotes around horses. At one time they were as much a part of the scene as locos & rolling stock, similar to Station Cats. Apparently it was a poor railway facility that didn't have at least one cat, and the GWR even paid for established station cats with provision for a milk quota.
When the Class 31* went past at 5:50, was anyone else expecting it to have a Triang powered bogie, with the dummy middle axle 'wheels' that were cut off above the rails?

.....no, just me, then?
* I know they weren't 31s at the time, but being raised with TOPS, I wasn't sure of the exact "Type" description