tunnelbane

Etymology
From.

Noun

 * 1) underground railway, subway, metro

Etymology
From.

Noun

 * 1) underground, or underground railway (usually UK)
 * 2) subway (usually US)
 * 3) metro

Etymology
From.

Noun

 * 1) underground, or underground railway (usually UK)
 * 2) subway (usually US)
 * 3) metro