DR series 97.5
| Hz (Württemberg) DR series 97.5 |
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|---|---|
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| Numbering: | 97 501-504 |
| Number: | 4th |
| Manufacturer: | Esslingen |
| Year of construction (s): | 1922/1925 |
| Retirement: | 1962 |
| Type : | E h2t / h4vt |
| Genre : | ZZ 55.15 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 11,870 mm |
| Fixed wheelbase: | 5,780 mm |
| Smallest bef. Radius: | 100 m |
| Empty mass: | 59.2 t |
| Service mass: | 74.9 t |
| Friction mass: | 74.9 t |
| Wheel set mass : | 15.0 t |
| Top speed: | 50 km / h / 10 km / h |
| Indexed performance : | 610 kW / 625 kW |
| Starting tractive effort: | ≈ 168 kN (simple steam expansion) ≈ 84 kN (combined operation) |
| Driving wheel diameter: | 1,150 mm |
| Gear system : | Riggenbach |
| Cylinder diameter: | 560 mm |
| Piston stroke: | 560 mm |
| Cylinder d. Gear drive: | 560 mm |
| Piston stroke gear drive: | 560 mm |
| Boiler overpressure: | 14 bar |
| Number of heating pipes: | 122 |
| Number of smoke tubes: | 24 |
| Heating pipe length: | 4300 mm |
| Grate area: | 2.50 m² |
| Radiant heating surface: | 12.60 m² |
| Tubular heating surface: | 103.68 m² |
| Superheater area : | 42.30 m² |
| Evaporation heating surface: | 116.28 m² |
| Water supply: | 7.0 m³ |
| Fuel supply: | 4.0 tons of coal |
| Brake: | Hik GP, various special editions |
The 97.5 series were Zahnradlokomotiven still from Württembergische Royal State Railways as Wuerttemberg Hz developed, but only to the German Reichsbahn were delivered. She classified this as 97.5 in the numbering plan . They were used on the Honau – Lichtenstein cog railway and remained there until they were withdrawn in 1961. One of the copies then came to the delivery company, the Esslingen machine factory in Esslingen am Neckar , where it was erected as a memorial.
Due to 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 pair of cylinders. On the plain, the engines ran like normal steam locomotives with the lower pair of cylinders. The gear wheel and rack were manufactured using the Riggenbach system. Before entering the rack, the upper engine was put into operation with live steam. At the same time, the number of tours was adapted to the driving speed so that the entry into the rack could take place smoothly. If the gear wheel was in mesh with the rack, the exhaust steam from the lower cylinders was diverted to the upper cylinder with a slide and only then went out to the chimney. The locomotive now worked as a compound machine.
The cylinders of the friction machine and the gear machine have the same diameter of 560 mm. The difference in volume (after exiting the friction drive, the steam doubles its volume) is compensated for by the fact that the gear drive rotates twice as fast. The drive gear is mounted in a special frame that rests on the second and third axis. The high gear drive and the low gear are coupled via a back gear with a gear ratio of 1: 2.43.
From 1952, 97 502 and 504 were modernized in the Esslingen machine factory to increase travel speeds in friction and rack and pinion operation.
The boilers got steel fire rifles and the frames were reinforced, especially in the area of the gear drive. The laterally displaceable end axles were fitted with return springs to reduce rolling. To expand the radius of action, 97 501, 502 and 504 were given a one-ton coal box attachment.
Of the four machines built, three have been preserved:
- 97 501 at the Association of Friends of the Honau – Lichtenstein Rack Railway (ZHL) in Reutlingen
- 97 502 in the railway museum in Bochum- Dahlhausen
- 97 504 in the German Museum of Technology in Berlin
The 97 501 was refurbished in 25 years of voluntary work and has been fully operational again since 2012, after 50 years of downtime, initially without gear drive, and since 2013 now complete with the exception of the gear.
The only specimen to be scrapped was 97 503 in 1957.
Web links
Individual evidence
- ^ Eisenbahn-magazin 12/2012, p. 26f.