Sky-tram used the most popular way to travel from all over Japan to The Orbital City on the space elevator. After the great flood, sky-tram also becomes quite useful for inter-city travel.
Coral is often asked by one mysterious client to fix the ticket machine in this station tower, which sounds very strange to her. After all, the sky-tram has not been operating for at least a few decades. Guess it's good spirit to keep the facility running.