Let me also put in my vote for "Garratts of Zimbabwe". It is one of my favorite steam videos.
Even today, despite their damnedest efforts to the contrary, Garratts are STILL working in Zimbabwe. Dusty Durrant's recent book on Zimbabwe steam "The Smoke That Thunders" details how recently overhauled 20th Class 4-8-2+2-8-4 Garratts were scrapped in the late 90's at the urging of the Canadian rail consultants to ensure that they couldn't be returned to service during Zimbabwe's perpetual shortages of foreign currency which sideline their diesels for lack of spare parts and/or fuel. This is another excellent book with plenty of Garratt coverage if you're interested.