Chris Tarrant: Extreme Railway Journeys

Trans-Caucasus Railway (3x4)

Air date: Nov 21, 2016

Chris Tarrant travels on the historically Soviet Trans-Caucasus Railway, beginning in the Azerbaijani city of Baku before exploring the Geogian capital Tbilisi's vintage metro system, then a mountain rail bridge designed by Eiffel, and finally a tunnel reputed to be held together with egg yolk.