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The long and level stretch of line, the nearest suitable abandoned line to Cambridge, was ideal for the Observatory's CLFST, AMI, One-Mile and Ryle rail-mounted radio-telescopes which move along a 4.8 km length of track of approximately 20 ft gauge.
This act set the gauge to be used by the railroads at four feet and eight and one-half inches, a gauge that had previously been used by George Stephenson in England for the Liverpool and Manchester Railway (1830) and was already popular with railroads in the Northeastern states.
To begin with they were designated as class H M T K V, which meant that they were locomotives built by Hartmann (H) to a Meyer design (M) as a tank engine (T) with a 750mm rail gauge (K) and compound engine (V).
The Třemešná ve Slezsku - Osoblaha railway is a narrow gauge line connecting Třemešná ve Slezsku on the Krnov - Głuchołazy line with the border town Osoblaha.
These units, numbered 50 and 51, had EE 8SVT engines (the only such engines in Australian built locomotives), and were built to the British Rail Class 20 specifications excepting rail gauge and some body detail.