Garratt:
The Garratt design solves a difficult problem: how do you build a powerful steam locomotive with a big boiler that can
negotiate tight curves. The answer: put the boiler between, not over, the wheels. Then put the fuel and water supplies
over the articulated drive units.
In 1927, Hanomag in Germany built twelve Garratt locos for the 2-foot gauge line of the South African Railways. They were a great success: they could haul trains weighing 180 tons up 3% grades, while running at up to 40 mph on level track.
Far from South Africa, NGG 13 Number 60 now resides on the Schinznacher Baumschulbahn (SchBB) in Switzerland after a complete restoration over a ten-year period.
Big Boy:
A total of 25 of the behemoth Big Boy locomotives were built for the Union Pacific Raiload by the Alco shops
between 1941 and 1944. The 4-8-8-4 Big Boy was the largest successful engine ever created. It was designed to
eliminate helpers and to pull heavy tonnage over the 1.55% continuous grade up Sherman Hill in the Wasatch mountain region
east of Ogden Utah. Prior to the Big Boy, it wasn't unusual to see as many as four engines struggling up Sherman Hill. The same load
could be handled by one Big Boy with one engine crew, saving the Union Pacific significantly.
The first one, #4000, was built in 1941 and was immediately put into service. The last Big Boy was retired in 1962 - a reign of 21 years. Each Big Boy logged more than a million miles in its lifetime. Of the 25 built, eight survive today in parks and museums around the country.
Unfortunately,
Big Boy #4000 is not one of the surviving locomotives, but my model of #4000 lives on to commemorate its life and times.
Although the model is stationary, I've powered its display track so that the lighting
can be operated. The headlight and illuminated marker lights are on the front, there are work lights
under the running boards, and the cab is lit. The firebox is lighted, and the ash pan glows. It looks like it's ready to go!
The tender, with its 14 large wheels, looks good in the dark too.