3 sentences

1. 这条铁路线贯通南北。

   zhè tiáo tiě​lù​xiàn guàn​tōng nán​běi.

   This railway line connects the north and the south.

   Source: Dong Chinese Dictionary

2. 这两条铁路线在城市中心交叉。

   zhè liǎng tiáo tiě​lù​xiàn zài chéng​shì zhōng​xīn jiāo​chā.

   These two railway lines cross in the city center.

   Source: Dong Chinese Dictionary

3. 这两条重要的铁路线在前方的一个小镇交会。

   zhè liǎng tiáo zhòng​yào de tiě​lù​xiàn zài qián​fāng de yī gè xiǎo​zhèn jiāo​huì.

   These two important railway lines converge in a small town up ahead.

   Source: Dong Chinese Dictionary