Double sphere coordination point charge field model

International Service Coordination Center

PCF Point coordination function

Service Coordination

freight train inspection and service point

freight train main inspection and service point

inspection and service point for car before loadin

NSP Native Service Point

NSP Network Service Point

overland common point service {= OCP service}

passenger train inspection and service point

point-to-point service

Self-service service terminal

service point

single-plane (through-plane service) service

transit freight train inspection and service point

Long-Point Point

point point protocol

point point protocol terminated aggregation