铁路 + Noun (e.g., 系统, 网络)
铁路 (tiělù) means "railway" or "railroad" and refers to the track system and infrastructure used for train transportation. It is the standard term used in formal and everyday Chinese when discussing rail networks and train travel.
中国的铁路网络非常发达。
zhōngguó de tiělù wǎngluò fēicháng fādá.
China's railway network is very well developed.
这条铁路连接了两座城市。
Zhè tiáo tiělù liánjiē le liǎng zuò chéngshì.
This railway connects two cities.
他在铁路局工作了二十多年。
Tā zài tiělù jú gōngzuò le èrshí duō nián.
He worked at the railway bureau for over twenty years.