Foggy Bottom Railroad 7/8n2: Building Small Steam Locomotives

Saturday, August 22, 2009

Building Small Steam Locomotives

Well while I'm waiting around for my SVE parts to come in, I ordered Building Small Steam Locomotives by Peter Jones. I've been eyeing it for over a month, and it was highly recommended by the guys at SE Lounge. The book covers how to build large scale locomotives that run on actual steam, including turning or milling your own parts. I'm defiantly looking forward to it.

On the table saw I mentioned earlier, I think I might shop the garage sale or craigslist market to find a good condition used one. Seems as though the price can easily get out of control for features that are nice, but that I probably don't need.

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What is 7/8n2?

A way in which trains are classified is the width between the rails. It's known as the 'gauge'. In the United States, most trains people think of when they think of trains are Standard Gauge railroads. In standard gauge, the width between the rails is 4 ft 8.5 in.

Other gauges exist. In particular, anything skinnier than standard gauge is classified as "Narrow Gauge". Narrow gauge typically ranges from about 18" up to 36".

7/8n2 is a scale that is focused on 2 foot gauge; hence the "n2" part at the end. It stands for "narrow, 2 foot". 2 foot gauge railways (that is, 24 inches between the rails) were used throughout the world, but more notably in european countries and south africa. Narrow gauge trains were smaller in size. They hauled less cargo, but their advantage was they were cheaper to build and could negotiate tighter turns than standard gauge.

Most of the 2ft gauge railways there were in existence have gone, but some are still maintained. The most notable 2ft gauge in the US was found in Maine, and is the only 2ft gauge railway to haul general freight. Most other 2ft railways were typically focused on industrial use, for example, hauling peat or slate from a mine to a processing facility.

So if "n2" means narrow 2 foot, what's the 7/8? It means the scale is 7/8 of an inch represents 1 foot in real life. It's a ratio of 1:13.7. 7/8n2 is a fairly large scale. A 2 foot gauge boxcar that in real life was 10 feet long and 6 feet tall would be 8.75 inches long and 5.25 inches tall if modeled in real life.

If that was all too complex, think of it this way: 7/8n2 is a large scale to model small trains.