This item is an HGV carrier wagon from the HGV rake of wagons. The passenger shuttle carrier and loaders are also available. Much larger than any standard British or Continental N Gauge.
PT Models Channel Tunnel Single Deck Carrier wagon - N gauge
PT Models Channel Tunnel Double Deck Carrier wagon - N gauge
PT Models Channel Tunnel Double Deck Loader wagon - N gauge
"Why Britain Needs a Channel Tunnel" 1962 Publ. Channel Tunnel Study Group
The Channel Tunnel The Facts 1964 Publ. Channel Tunnel Study Group Guardian Libr
British Rail Channel Connection Channel Tunnel Official Brochure