Even better, there's some spillover from the very ragged end of the Russian Civil War into the Warlord-era Chinese squabbles - a lot of the Siberian Whites fled over the frontier into China as the Bolsheviks seized control of Siberia and far eastern Russia.
They brought some toys with them - according to the Osprey on armoured trains, that included at least a few armoured trains, and a number of reasonable-intact combat formations, all of which found employment in the forces of various northern Chinese warlords...