double-heading
The use of two locomotives at the front, or head, of a trainThe use of two locomotives at the front, or head, of a train.
Meaning
1 senses(uncountable)The use of two locomotives at the front, or head, of a train.
Word family
3 related wordsLessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable