DRG Class 97
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DRG Class 97
DRG Class 97 is a class of German rack railway steam locomotive operated by the Deutsche Reichsbahn comprising: * Class 97.0: Prussian T 26 * Class 97.1: Bavarian PtzL 3/4 * Class 97.2: Baden IX b * Class 97.2II: kkStB 69 * Class 97.3: Württemberg Fz * Class 97.3II: kkStB 269 * Class 97.4: Prussian T 28 * Class 97.4II: BBÖ 369, later ÖBB 297 * Class 97.5: Württemberg Hz * Class 97.6: kkStB 169 References

* {{Locomotive index Steam locomotives of Germany, 97 Deutsche Reichsbahn-Gesellschaft locomotives, 97 Rack and cog driven locomotives ...
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Rack Railway
A rack railway (also rack-and-pinion railway, cog railway, or cogwheel railway) is a steep grade railway with a toothed rack rail, usually between the running rails. The trains are fitted with one or more cog wheels or pinions that mesh with this rack rail. This allows the trains to operate on steep gradients of 100% (45 degrees) or more, well above the 10% maximum for friction-based rail. The rack and pinion mechanism also provides more controlled braking and reduces the effects of snow or ice on the rails. Most rack railways are mountain railways, although a few are transit railways or tramways built to overcome a steep gradient in an urban environment. The first cog railway was the Middleton Railway between Middleton and Leeds in West Yorkshire, England, United Kingdom, where the first commercially successful steam locomotive, ''Salamanca'', ran in 1812. This used a rack and pinion system designed and patented in 1811 by John Blenkinsop. The first mountain cog railw ...
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