Taking place in the kaleidoscopic future of Ian McDonald's "Desolation Road," this novel is set on a terraformed Mars where fusion-powered locomotives run along the network of rails that is the planet's circulatory system and artificial intelligences reconfigure reality billions of times each second. One young woman, Sweetness Octave Glorious-Honeybun Asiim 12th, becomes the person upon whom the future - or futures - of Mars depends. Big, picaresque, funny; taking the Mars of Ray Bradbury and the more recent, terraformed Marses of authors such as Kim Stanley Robinson and Greg Bear, "Ares Express "is a wild and woolly magic-realist SF novel, featuring lots of bizarre philosophies, strange, mind-stretching ideas and trains as big as city blocks.