We attended on Saturday, there were 30 full sized road steam engines present and it was generally warm and sunny.
What not to enjoy including the Ukulele band playing in the beer tent with a walk in bass player when someone (and maybe an engine or two) got stuck in an enormous jam on the M1.
(So it's not impossible that Sunday may have seen an extra engine or two as there were three 'no shows' in the excellent complementary programme.
Linked as usual from the 2019 index page:
http://www.internationalsteam.co.uk/.../ukindex19.htm