down train; outbound service
Refers to a train, bus, or flight traveling away from Tokyo or a major hub toward a more remote destination. The opposite is 上り便 (のぼりびん).
What time does the next down train leave?
There is only one outbound bus per hour.
Compound of 下り (くだり, 'downward') and 便 (びん, 'service, flight, mail'). The directional sense follows the traditional Japanese railway convention where trains toward the capital are 上り and those away are 下り.