pilot engine

Noun

A locomotive going in advance of a train to make sure that the way is clear.

Japanese Meaning

先導機関車（列車の先頭を走り、路線の安全を確認するための機関車）

The pilot engine ran ahead of the express to inspect the line for fallen trees and debris.

特急の前を先導機関車が走り、倒木やがれきがないか線路を点検した。

Sense（1）

A locomotive going in advance of a train to make sure that the way is clear.

pilot engines

（ plural ）