The Chinese wheelbarrow is one of those wonderful bits of historical flavor I love about the classic era. This particular illustration comes to us from the "Shanghai" pages of the New York Public Library's digital collection.
Well into the modern era a huge amount of China's land transportation
was handled by a massive network of roads and trails designed for these
unique, mono-wheeled carts. They're the kind of thing any adventurer in China, in particular those taking part in Chaosium's "Masks of Nyarlathotep", would run into on a regular basis.
It's an ingenious design capable of carrying huge loads because all the weight is supported by the single large wheel. The operator simply steers and provides the motive force. That's in contrast to the traditional western wheelbarrow, which forced the user to continuously lift roughly half the weight. The single wheel also made infrastructure maintenance considerably easier. Two and four wheeled carts needed a full sized road that required constant grading, drainage, and repairs to stand up to heavy use. Chinese wheelbarrows only needed a six inch wide trail to support the single wheel, something even the smallest of villages could manage.
If you're curious to learn more Low Tech Magazine has a detailed, in-depth article on the subject you'll enjoy. I'll warn you ahead of time that if you start browsing the site you could easily lose track of time. It's filled with engrossing looks at "primitive" and early industrial technology.