Tsurumi Station is considered to be the origin of the Musashino Line; trains going clockwise (toward Nishi-Funabashi) are therefore referred to as heading "down" (下り, kudari), while trains going counter-clockwise (toward Fuchūhommachi) are heading "up" (上り, nobori).
This is often counterintuitive, as it results in through trains to Tokyo being labeled and numbered as "down" trains while on the Musashino Line; however, such trains switch to "up" after joining the Keiyō Line.

All eastbound (for Nishi-Funabashi) passenger trains begin service at Fuchū-Hommachi Station.
For details on the Musashino South Line and other branch lines, which are freight-only sections, can be found below the passenger station list.
Tsurumi Station is considered to be the origin of the Musashino Line; trains going clockwise (toward Nishi-Funabashi) are therefore referred to as heading "down" (下り, kudari), while trains going counter-clockwise (toward Fuchūhommachi) are heading "up" (上り, nobori). This is often counterintuitive, as it results in through trains to Tokyo being labeled and numbered as "down" trains while on the Musashino Line; however, such trains switch to "up" after joining the Keiyō Line.
All eastbound (for Nishi-Funabashi) passenger trains begin service at Fuchū-Hommachi Station. For details on the Musashino South Line and other branch lines, which are freight-only sections, can be found below the passenger station list.
Musashino Line