At the beginning when they designed the Channel Tunnel. Now,

来源: 于 2024-02-18 09:07:13 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次
How many rails are in the Chunnel?
 
two rail tunnels
 
The Chunnel actually comprises three tunnels: two rail tunnels, used for freight and passenger trains, and a service tunnel.