What the hell is a wooden ox and a flowing horse?

Cattle herding Liu Ma was a means of transportation invented by Zhuge Liang, prime minister of Shu and Han Dynasties in the Three Kingdoms period, which was divided into cattle herding and Liu Ma. It was used by Zhuge Liang in the Northern Expedition from the 9th to 12th year of Jianxing (23 1 -234). Its carrying capacity is "one-year-old grain", about 400 kilograms, and its daily trip is "dozens of special brigades, three miles in groups", providing food for 100 thousand troops in Shu. But the specific way and appearance are unknown now, and there are different explanations. ?