This is the 4267th most frequent Korean word.
철도
Railroad.
Here, '철도' is used to refer to the railways in general as an infrastructure or system in the context of transportation.
1. 철도는 오래전부터 주요 교통수단으로 사용되었습니다.
The railway has long been used as a major means of transportation.
In this sentence, '철도' specifically denotes a certain railway line being constructed.
2. 새로운 철도 노선이 올해 완공될 예정입니다.
A new railway line is scheduled to be completed this year.
Here, '철도' relates to the maintenance and operational aspect of the railway system.