DRG Class 01

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DRG Class 01
01118 Koenigstein.jpg
01 118 at Bahnhofsfest Königstein Pfingsten 2007
Quantity231 + 10 former Class 02s
ManufacturerAEG, BMAG, Borsig, Henschel, Hohenzollern, Krupp
Year(s) of manufacture1926–1938
Wheel arrangement4-6-2
Axle arrangement2′C1′ h2 (Pacific)
TypeS 36.20
Track gauge1,435 mm (4 ft 8 12 in)
Length over buffers23.940 m (78 ft 7 in)
Service weight108.9 tonnes (107.2 long tons; 120.0 short tons)
Adhesive weight59.2 tonnes (58.3 long tons; 65.3 short tons)
Axle load20.2 tonnes (19.9 long tons; 22.3 short tons)
Top speedforwards: 120 or 130 km/h (75 or 81 mph)
backwards: 50 km/h (31 mph)
Indicated Power1,648 kW (2,210 hp)
Driving wheel diameter2,000 mm (78.74 in)
Leading wheel diameter01 001–101, 233–242: 850 mm (33.46 in)
01 102–232: 1,000 mm (39.37 in)
Trailing wheel diameter1,250 mm (49.21 in)
Valve gearWalschaerts (Heusinger) with lifting links
Cylinder bore01 001–010: 650 mm (25.59 in)
01 012–232: 600 mm (23.62 in)
Piston stroke660 mm (25.98 in)
Boiler Overpressure16 bar (1.60 MPa; 232 psi)
No. of heating tubes01 001–076: 129
01 077–: 107
No. of smoke tubes01 001–076: 54
01 077–: 70
Heating tube length01 001–076: 5,800 mm (228.3 in)
01 077–: 6,800 mm (267.7 in)
Grate area01 001–149, 233–242: 4.41 m2 (47.5 sq ft)
01 150–232: 4.32 m2 (46.5 sq ft)
Radiative heating area17 m2 (180 sq ft)
Superheater area01 001–076, 233–242: 100.00 m2 (1,076.4 sq ft)
01 077–232: 85.00 m2 (914.9 sq ft)
Evaporative heating area01 001–076, 233–242: 237.56 m2 (2,557.1 sq ft)
01 077–149: 247.25 m2 (2,661.4 sq ft)
01 150–232: 247.15 m2 (2,660.3 sq ft)
Tender2'2' T 30/32/34
Water capacity30.0/32.0/34.0 m3
Fuel10.0 t hard coal
Train heatingSteam

The Deutsche Reichsbahn-Gesellschaft's BR 01 steam locomotives were the first standardised (Einheitsdampflokomotive) steam express passenger locomotives built by the unified German railway system. They were of 4-6-2 "Pacific" wheel arrangement in the Whyte notation, or 2′C1′ h2 in the UIC classification. The idea of standardisation was that it would reduce maintenance costs; i.e. if a BR 01 whose engine shop was in, say, Berlin broke down in Dresden, instead of having to ship the necessary part from Berlin and take the locomotive out of service, a part from the Dresden shop could be used as all of the engines, parts, and workings were exactly the same and produced nationwide. Thus it was a "standard" product for engine shops.


DRG steam locomotive 01 046 at the former RAW in Frankfurt am Main-Nied in the year 1938
Manufacturer’s plate of 01 118 of the Frankfurt Historic Railway

The firms of AEG and Borsig, who were the main manufacturers of these engines, together with Henschel, Hohenzollern, Krupp and BMAG previously Schwartzkopff, delivered a total of 231 examples of this Einheitsdampflokomotive between 1926 and 1938 for the fast passenger services of the Deutsche Reichsbahn.

To begin with, 10 locomotives of this class were built with two-cylinder engines for comparison purposes alongside a similar batch of 10 engines of their sister Class 02, which had four-cylinder compounding. Extensive measurement and trial runs were conducted, but after lengthy discussions the controversial decision finally fell in favour of the two-cylinder configuration, which was simpler to maintain but less powerful and less economical than the four-cylinder compounds.

The first Class 01 locomotive that went into service was not 01 001, but 01 008, which is preserved today in the Bochum-Dahlhausen Railway Museum. The mass production of Class 01s was somewhat delayed at first because in the 1920s there were neither enough routes with the necessary axle load of 20 tons nor sufficiently large turntables. Not until the beginning of the 1930s did the Class 01 become the predominant express train locomotive of the Deutsche Reichsbahn. By 1938 there were 231 Class 01 locomotives available for the prestigious express train duties. Another 10 four-cylinder Class 02 locomotives (01 111, 01 233–241) were converted to two-cylinder Class 01 models between 1937 and 1942. To accommodate for the many routes with axle load restrictions too low for Class 01 service, in the early 1930s, a third variant was created: the Class 03 designed with a two-cylinder engine and axle load of 18 ton, of which no less than 298 were built. Launched in 1939, the three-cylinder DRG Class 01.10 was a further development of the 01.

A total of five series or batches were delivered, each with minor variations: 01 001–010 (1926), 01 112–076 (1927–28), 01 077–101 (1930–31), 01 102–190 (1934–1936), 01 191–232 (1937–1938).

Even in the 1930s the employment of Class 01s was limited to the relatively few routes that had already been modified to take a 20-ton axle load. From Berlin outwards they were the Anhalt, Lehrte and Hamburg lines. The Berlin City Railway had first to be strengthened by reinforcing the viaduct arches. Up to 1930, the first 90 engines were stationed at the locomotive depots of Essen, Nuremberg, Erfurt P, Berlin Ahb, Hamm, Magdeburg Hbf, Kassel, Hanover, Hamburg Altona, Bebra and Offenburg. From 1931 they were also stabled at Frankfurt (M) 1, Berlin Leb, Braunschweig, Berlin Pog, Schneidemühl, Königsberg, Göttingen P, Paderborn, Dresden Alt, Breslau, Cologne Deutzerfeld, Hof and Halle P.

Locomotive 01 118 of the Frankfurt Historic Railway
View of the driver's cab on locomotive 01 008

Originally, the Class 01's top speed was restricted to 120 km/h. In order to raise this to 130 km/h, the diameter of the leading wheels was changed from its original 850 mm to 1,000 mm on locomotives from operating number 01 102 onwards and brake effort was increased by installing double-sided working of the brake shoes on the coupled wheels and by braking the trailing wheels. The air and feed pumps were located in smokebox recesses behind the large Wagner smoke deflectors, which had been fitted from 01 077 onwards. (Earlier models were also refitted with Wagner type deflectors later). This made access to the pumps for maintenance purposes more difficult and later Einheitsloks had their pumps located in the middle of the vehicle on delivery. The Deutsche Bundesbahn converted their engines to the smaller Witte smoke deflectors and moved the pumps to the running board in the centre of the vehicle. The Deutsche Reichsbahn in East Germany shied away from such major changes to the load distribution, so that only minor modifications in appearance can be seen even in their last years.

From the third series (01 077 et seq.) the boilers were delivered with longer smoke tubes and thus a shorter firebox. All engines originally had a central lock for the smokebox door. The first locomotives had gas lighting on delivery; from 01 010 they had electrical lighting and the last few batches were given a third headlight.

The Class 01s were equipped with 2'2 T 30, 2'2' T 32 or 2'2' T 34 tenders. Their coal capacity was 10 tons of stone coal, and the water tank held either 30, 32 or 34 cubic metres of water. The prototype locomotives, 01 001 to 01 010, were supplied with the smaller 2'2 T 30 tenders, because there were not enough large turntables around. Later these tenders were only used if they were absolutely necessary, e.g. in cross-border services with the Netherlands. From the second series (01 012 et seq.) on, the Class 01 was furnished with rivetted 2'2' T 32 tenders. The welded tenders, class 2'2' T 34, appeared only by way of exchange (mainly from brand new Class 44) locomotives. Thereafter they were almost the only ones used during the war years and after the Second World War, because they had a larger water capacity.

Class 01 locomotives remained in service with the Deutsche Bundesbahn until 1973. In the DR, they were still working up to the early 1980s, largely in their original state with large smoke deflectors. They were legendary in their last years for hauling the D-Zug services on the Berlin-Dresden route up to autumn 1977. Only when the large Soviet DR Class 132 diesel locomotives arrived, the Class 01 express train locomotives were finally forced out of scheduled services in the GDR after almost 50 years.


Rebuilds 1950 to 1957 (DB)[edit]

Henschel mixer preheater rebuild
Service weight111.1 tonnes (109.3 long tons; 122.5 short tons)
Adhesive weight60.0 tonnes (59.1 long tons; 66.1 short tons)
Axle load20.0 tonnes (19.7 long tons; 22.0 short tons)
Indicated Power1,802 kW (2,417 hp)
Grate area4.31 m2 (46.4 sq ft)
Superheater area95.00 m2 (1,022.6 sq ft)
Evaporative heating area216.23 m2 (2,327.5 sq ft)

In 1950 and 1951, the Deutsche Bundesbahn converted locomotives 01 042, 01 046, 01 112, 01 154 and 01 192. They were enhanced with a Heinl mixer preheater by Henschel and a turbo feed pump. In addition combustion chambers were installed in the boilers. Finally the conversion was rounded off with the replacement of the original smoke deflectors by Witte deflectors, which in spite of their considerably smaller size were just as effective as their larger predecessors. Four of the five modified locomotives remained in service until 1968.

Rebuilds 1957 to 1961 (new DB boiler)[edit]

New DB boiler design rebuild
Service weight108.3 tonnes (106.6 long tons; 119.4 short tons)
Adhesive weight57.6 tonnes (56.7 long tons; 63.5 short tons)
Axle load19.8 tonnes (19.5 long tons; 21.8 short tons)
Indicated Power1,714 kW (2,299 hp)
Grate area3.96 m2 (42.6 sq ft)
Superheater area100.54 m2 (1,082.2 sq ft)
Evaporative heating area193.09 m2 (2,078.4 sq ft)

From 1957 the Deutsche Bundesbahn rebuilt a further 50 vehicles. These engines were given welded, high-performance, steam boilers, which had already been used on the DRG Class 01.10. In addition a new mixer preheater system was installed in the smokebox and numerous friction bearings were replaced by roller bearings. Changes to the cylinder block, running board, a shorter chimney, front apron (Frontschürze) and locomotive frame, as well as the missing feedwater dome, all gave the locomotives a different external appearance.

Reboilered 01 class near Hof at Easter 1972.

DR Reko locomotive 01.5[edit]

Rekolok 01 519

From 1962, the Reichsbahn repair shop (Reichsbahnausbesserungswerk) at Meiningen rebuilt 35 Class 01 engines for the DR under the direction of the research and trials division VES-M Halle. Like the DB, they selected only those locomotives with more powerful brakes (from 01 102). All these locos were fitted with new Witte smoke deflectors with tapered edges, a new driver's cab and a new boiler, positioned higher on the frame. The boiler had a combustion chamber, a mixer preheater and a continuous cover for the dome.

Preserved locomotives[edit]

01 118 at Bahnhofsfest Königstein Pfingsten 2007 seen from front above
01 118 at Bahnhofsfest Königstein Pfingsten 2007 seen from back above
01 533 in Lindau Hbf

Operational locomotives[edit]

Only a few locomotives of the original design have been preserved unchanged over the course of time.

Of the two-cylinder Class 01 engines, the following are currently operational:

  • 01 118, built in 1934, is the only one to have been operational without interruption until today. After the war it was in service with the DR; since 1981 it has belonged to the Historic Railway, Frankfurt (Historische Eisenbahn Frankfurt). From its base in Frankfurt Osthafen it is regularly used for museum services, including on the Frankfurt Harbour Railway (Frankfurter Hafenbahn).
  • Another operational locomotive of this class is 01 066, built in 1928 by Schwartzkopff and which was on duty with the Deutsche Reichsbahn until 1977. Thereafter it was used as a heating engine until 1989 in the VEB Genthin washing powder factory in Nauen. The Bavarian Railway Museum in Nördlingen rebuilt the partly preserved locomotive in the Meiningen Steam Locomotive Works from individual components from other locomotives, including those of other classes – and put it back in service in summer 1993.
  • The third operational locomotive is 01 202, that is worked by the Verein Pacific 01 202 in Switzerland. This loco was last in service with the DB and had Witte smoke deflectors. It has retained its original boiler, but lost the front apron. After its retirement in 1975, the engine was rebuilt again over 20 years with great initiative and made operational again. It was given a red livery stripe on the tender at the height of the running plate.
  • Locomotive 01 116, which was built in 1934 with factory no. 1413 by Krupp and rebuilt in 1964/65 at RAW Meiningen, runs today as 01 533 with ÖGEG in Austria.
  • 01 150 – DB Museum locomotive in DB configuration with Witte smoke deflectors. A new DLW Meiningen boiler was installed in 2012. On 17 October 2005 it was badly damaged by the great fire at the Nuremberg/Gostenhof locomotive depot. After inspecting the badly damaged steam engine at DLW Meiningen, DB AG initially intended just to carry out a cosmetic refurbishment; but after a donation marathon initiated by the last engine driver, Olaf Teubert, who collected nearly € 1M within two years, a full operational restoration was enabled from 2011 to 2012. Since May 2013 the restored steam engine has been made operationally ready for use on the German railway network again.

Non-operational locomotives[edit]

In addition there are several Class 01 and 01.5 locomotives that have been preserved as non-operational exhibits:

001 150-2 waits to leave Regensburg with a train for Hof, August 1973.

PC games[edit]

The engine is featured in the 2006 PC game, Sid Meier's Railroads!, as an engine available for purchase in German scenario, albeit missing a tender and several key details.

See also[edit]


  • Weisbrod, Manfred (1999). Baureihe 01 Geschichte, Bau und Bewährung einer Schnellzuglokomotive. ISBN 978-3-344-70769-9.
  • Nagel, Gustav (2002). "Dampf, letzter Akt. 1962: Die Rekonstruktion der Baureihe 01 beginnt". LOK MAGAZIN. München: GeraNova Zeitschriftenverlag GmbH. 41 (248): 92–95. ISSN 0458-1822.
  • Melcher, Peter (2003). "Vom Winde verweht ... . Abschied von der DB-01". LOK MAGAZIN. München: GeraNova Zeitschriftenverlag GmbH. 42 (263): 104–111. ISSN 0458-1822.
  • Koschinski, Konrad (2006). Legendäre Baureihe 01 Extra-Kapitel Museumslokomotiven; Statistik. ISBN 978-3-89610-156-3.