Württemberg Hz

The Württemberg Hz were Zahnradlokomotiven that were still being developed by the Royal Württemberg State Railways, but only delivered to the German Reichsbahn. This she arranged as a series 97.5 in the numbering plan. They were used on the cog railway Honau Lichtenstein and remained there until their retirement in 1961. A copy then came to the delivery company, Maschinenfabrik Esslingen Esslingen am Neckar, where it was erected as a memorial.

By the Württemberg origin, there are common components with the Württemberg Tn and T 5

The locomotives had a gear drive according to the Winterthur system with a lower and an upper cylinder pair. In the plane of the machines ran like normal steam locomotives with the lower cylinder pair. Before entering into the rack, the upper engine with steam was put into operation. Simultaneously, the number of revolutions of the driving speed was adjusted so that the driveway could easily take place in the rack. Was the gear in mesh with the rack, the exhaust steam from the bottom cylinders is deflected with a slider to the upper and then went out of the chimney. The locomotive was now working as a compound machine.

The cylinders of the engine friction and the gear have the same diameter of 560 mm. The difference in volume (from the exit from the friction of the steam engine doubled in volume ) is compensated in that the gear engine rotates twice as fast. The driving gear is supported by a special frame which rests on the second and third axis. The high-side gear engine and the low-lying gear are coupled via a countershaft with the gear ratio 1:2,43.

From 1952, the travel speeds in friction and rack operation were modernized 97 502 and 504 in the Maschinenfabrik Esslingen to increase.

The boilers were steel firebox and the frames were, especially in the area of the gear drive mechanism, strengthened. The side shiftable end axles were to reduce snaking return springs. To extend the operating range were 97 501, 502 and 504 a tonne of coal a comprehensive coal-box attachment.

Of the four machines built are preserved three remained:

The 97 501 was worked up in 25 years of volunteer effort, and which is since 2012 after 50 years of standstill without first gear drive, now completed since 2013 to the gear, again fully operational.

Left

97 501 eV at WZR Friends of the cog railway Honau Lichtenstein