Railroad lines are an essential mode of transportation that operates via railways. They are most commonly referred to as train tracks or railway tracks, which are metal plates designed to support the weight of trains. The term "railroad line" also has many synonyms such as railway system, railway network, track system, rail network, and rail system. Each synonym emphasizes different aspects of the railroad, such as the extent of the network or the physical design of the tracks. Other related terms include the train route, train line, train track, and railway network infrastructure. Overall, the synonymy of railroad lines reflects the essential nature of this transportation system in connecting people and goods across great distances.