|Behind the scenes|
Bismuth is a stop on the route of the Argon Express, a non-local light rail which crosses the Outlands and regularly carries hundreds of programs. The trip from Argon City to Bismuth takes several hours at the train's top speed.
Bismuth Station has one wide platform fronting the light rail beam, and a tall transparent roof beyond which the city's towers and light beams stretch into the clouds. Trains passing through the city continue on the same beam to exit at the other side of the station. Keller believed that if she reached Bismuth, she could disappear among the programs there and start a new life.