railroad
preferred label: راه‌آهن @fa
type: Concept
related: railroad traffic control

railroad transportation
preferred label: ترابری با راه‌آهن @fa
type: Concept
related: railroad traffic control

railroad traffic control
related: railroad transportation
related: railroad
broader: traffic control
preferred label: کنترل ترافیک راه‌آهن @fa
type: Concept

traffic control
preferred label: کنترل ترافیک @fa
type: Concept
narrower: railroad traffic control