Numeral + 列 + 列车/火车
列 (liè) is a measure word used specifically for trains and similar vehicles traveling in a line. When counting trains, you say 一列火车 (one train) or 两列列车 (two trains), where 列 specifies the unit.
站台上停着一列火车。
zhàntái shàng tíng zhe yī liè huǒchē.
A train is stopped at the platform.
今天有三列高铁晚点了。
jīntiān yǒu sān liè gāotiě wǎndiǎn le.
Three high-speed trains were delayed today.
远处驶来一列货运列车。
yuǎnchù shǐ lái yī liè huòyùn lièchē.
A freight train is approaching from the distance.