Ilya Birman's work is greatly underappreciated. His Moscow Metro map proposal[1] was pretty cool, and his commuter rail map[2] summarizes the routes much better than its predecessors.
Frankly, personally I'm more captivated by the above-ground maps by both the Bureau and the Studio: the latter have at least the largest-format Metro map, with the city's points of interest, whereas Birman participated in stuff like this: https://ilyabirman.ru/ekaterinburg-metro/2016/