• Source: DR Class 99.23-24

The engines of 24.3/info/dr" target="_blank">DR 24.3/info/class" target="_blank">Class 24.3/info/99.23" target="_blank">99.23 are metre gauge tank locomotives, that were procured by the Deutsche Reichsbahn (24.3/info/dr" target="_blank">DR) in East Germany from 1954 to 1956. When they entered service they had operating numbers 99 231–99 247. Today they are numbered 99 7231–99 7247.




History


A total of 17 locomotives were bought by the 24.3/info/dr" target="_blank">DR between 1954 and 1956 for the railways of the Harzquerbahn and Brockenbahn, and for the line from Eisfeld to Schönbrunn to replace much of the outdated fleet. Four locomotives were built for the USSR in 1956, but their ultimate fate is unknown. The first seven units (99 231 to 99 237) were originally equipped with two Krauss-Helmholtz bogies. Due to problems with curve running, the engines in the second series were given Beugniot levers between the first and second coupled axles in addition to the Krauss-Helmholtz bogies (according to other sources also a Schwartzkopff-Eckhardt II bogie).
The locomotives of the first series were subsequently modified with Beugniot levers, some in the early 1960s, others in 1973/74 (on the Harz lines). The thinner wheel flanges of the driving wheels were completely removed later to achieve better curve running, resulting in the second series not having a rigid wheelbase. The drive was applied to the third coupled axle, the locomotives had Heusinger valve gear with unsprung Müller balanced slide valves and, later, Trofimoff valves.
These Neubaulokomotiven were a fully welded development of the standard locomotives (Einheitsloks) of the DRG 24.3/info/class" target="_blank">Class 99.22. In contrast to those, the 24.3/info/99.23" target="_blank">99.23-24s had mixer-preheaters and plate frames. However, the latter caused maintenance difficulties from the outset due to cracks and distortion. 10 locomotives (99 7232, 7240, 7245, 7239, 7236, 7234, 7237, 7241, 7243, 7247) were equipped from 2004 onward with a redesigned plate frame and 5 of those (99 7232, 7240, 7245, 7239, 7236) with new, welded steam cylinders. The 17 24.3/info/dr" target="_blank">DR engines are all extant and based in the Harz; some however are no longer working.
The 17 German engines were converted to primary oil-firing between 1977 and 1983, and together with the DRG 24.3/info/class" target="_blank">Class 99.22 are the most powerful German narrow gauge steam locomotives ever constructed. They were later converted back to coal-firing and are primarily used on the line up to the Brocken from Wernigerode.
Their operating numbers changed from 99 231 et seq to 99 7231 et seq on the introduction of computerised numbers in 1970 and then again to 99 0231 et seq on conversion to oil-firing. The computer numbers are still valid because the HSB retains those allocated in the 1970 24.3/info/dr" target="_blank">DR renumbering scheme.
The engines can carry 4 tonnes (4 long tons; 4 short tons) of coal and 8,000 litres (1,760 imperial gallons; 2,113 US gallons) of water.




Locomotives


99 7231: out of service since 2001
99 7232: working, new frame
99 7233: out of service since 1999
99 7234: working, new frame
99 7235: out of service since 2020
99 7236: working, new frame
99 7237: working, new frame
99 7238: working
99 7239: working, new frame
99 7240: working, new frame
99 7241: working, new frame
99 7242: out of service since 2010
99 7243: working, new frame
99 7244: working, undergoing conversion to oil-firing
99 7245: working, new frame
LKM 134023: built for & lost in the USSR
LKM 134024: built for & lost in the USSR
LKM 134025: built for & lost in the USSR
LKM 134026: built for & lost in the USSR
99 7246: out of service since 1996
99 7247: working, new frame




Photo gallery



















See also



List of East German Deutsche Reichsbahn locomotives and railbuses
Neubaulok




References



Obermayer, Horst J. Taschenbuch Deutsche Schmalspur-Dampflokomotiven, Franckh'sche Verlagshandlung, Stuttgart, ISBN 3-440-03818-1, 1971, pp. 60–61.
Vetter, Klaus J. Das große Handbuch deutscher Lokomotiven, Bruckmann, München, ISBN 3-7654-3764-6, 2001, pp 191–192.
Weisbrod, Manfred; Petznik, Wolfgang (1981). Dampflokomotiven deutscher Eisenbahnen, Baureihe 97–99 (EFA 1.4) (in German) (2nd ed.). Düsseldorf: Alba. pp. 137–141, 207. ISBN 3-87094-087-5.
Weisbrod, Manfred; Wiegard, Hans; Müller, Hans; Petznick, Wolfgang. Deutsches Lok-Archiv: Dampflokomotiven 4 (Baureihe 99), Transpress, Berlin,ISBN 3-344-70903-8, 1995, pp 53–57.




External links


Freundeskreis Selketalbahn website (in German)
HSB website (in German)

Kata Kunci Pencarian:

• Mahathir Mohamad
• Mercedes-Benz Kelas-A
• Institut Teknologi Sepuluh Nopember
• Johannes Leimena
• INews
• Fakultas Kedokteran Universitas Indonesia
• Kota Palembang
• Frederik X dari Denmark
• Ronald Plasterk
• Fluorin
• DR Class 99.23-24
• DRG Class 99.22
• 2-10-2
• Schwartzkopff-Eckhardt bogie
• NWE Nos. 11 to 22
• Class 99 (German narrow gauge locomotives)
• Trofimoff valve
• Selke Valley Railway
• Woodstock '99
• NWE No. 21