These are excerpts from an article that appeared in Military Modeling Manual in 1983 by Steven Zaloga.
The Chinese had over 1,000 Russian advisers by 1925. Most were experienced from the Russian Civil War and they worked primarily on armored trains. Trains were intended to be used offensively. They generally had 2 turreted guns, could carry troops and supplies, and were built so that they could go in either direction.
The first tanks to come to China were 36 FT-17s purchased from France and the first 10 arrived in 1924 as "agricultural tractors."
In 1927 General Chiang Kai-shek began to distrust his Russian advisers and began to purge the communists in his military and severed the ties with Russia. After this German advisors came.
In 1929 24 Vickers Carden Loyd MG carriers were ordered. These fought on the Lunghai front.
In April 1932 Marshal Liu Hsiang began building the Armored Car and Tank Corps in Chungking. The armored cars were built in Shanghai and were based on GMC M31 trucks with a 37 mm gun and 2 MGs in a turret.
In 1937 full scale war with Japan broke out. The 1st and 2nd Armored Battalions fount in and around Shanghai. Many of these were captured by the Japanese. By 1938 approximately 48 tanks remained out of a force of 96.
With the war the influence of the German advisors waned as they were withdrawn due to pressure from Japan. The Russians became advisors again and in 1938 sold 87 T-26 Model 1933 that went to form the 200th Mechanized Division. A few BA-6 armored cars were sold too.
After signing the nonaggression pact with Germany and defeating the Kwangtung Army at Khalkin Gol, Russia started to withdraw it's help from China