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Bavarian S 3/5

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Bavarian S 3/5 N
DRG Class 17.4
Bavarian S 3/5 Nr. 3303
Type and origin
BuilderMaffei
Build date1903–1907
Total produced39
Specifications
Configuration:
 • Whyte4-6-0
Gauge1,435 mm (4 ft 8+12 in)
Leading dia.950 mm (37.4 in)
Driver dia.1,870 mm (73.6 in)
Length:
 • Over buffers19,325 mm (63 ft 4.8 in)
Axle load15.0 t (14.8 long tons; 16.5 short tons)
Adhesive weight45.0 t (44.3 long tons; 49.6 short tons)
Service weight69.8 t (68.7 long tons; 76.9 short tons)
Tender typebay 2'2' T 21/21.8
Water cap.21.0 m3 (740 cu ft) / 21.8 m3 (770 cu ft)
Firebox:
 • Grate area3.27 m2 (35.2 sq ft)
Boiler pressure14 bar (1,400 kPa; 200 psi) (1st series)
16 bar (1,600 kPa; 230 psi) (2nd/3rd series)
Heating surface164.43 m2 (1,769.9 sq ft)
Cylinders4
High-pressure cylinder335 mm (13.189 in) (1st series)
340 mm (13.386 in) (2nd/3rd series)
Low-pressure cylinder570 mm (22.441 in)
Piston stroke640 mm (25.197 in)
Performance figures
Maximum speed110 km/h (68 mph)
Indicated power810 kW (1,090 hp)
Career
NumbersBavarian 3301-3328, 3330-3340
DRG 17 401–420
Retired1928ff.

The Class S 3/5 engines of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn) were express train steam locomotives with a 4-6-0 wheel arrangement.

Saturated steam variant

Between 1903 and 1907 Maffei delivered three batches of 39 locomotives in all. They had a four-cylinder, saturated steam compound engine. Unlike their forerunners, the Bavarian Class C V, the inside high-pressure cylinders and the outside low-pressure cylinders were angled and worked on the first coupled axle.

From the second series, built in 1904, the boiler pressure of the S 3/5 was raised from 14 to 16 bar (1,400 to 1,600 kPa; 200 to 230 psi). The tube lengths and diameter of the inside cylinders were also changed.

The S 3/5 engines built from 1904 were technically closely related to the S 2/5 which was being developed in parallel. The two classes only differed in their wheel arrangement and the larger coupled wheel diameter on the S 2/5; the boiler and running gear were the same and thus also their output power. Even the permitted top speed was identical on both classes (110 km/h or 68 mph). The S 3/5 N engines were, in terms of tractive effort (300 tonnes or 295 long tons or 331 short tons at 100 km/h or 62 mph), clearly superior to the S 2/5, because they had three driven axles. S 3/5 locomotives were stabled in the locomotive workshops at Munich I and Nuremberg.

The locomotives were coupled with Bavarian 2'2' T 21 and 2'2' T 21,8 tenders.

Superheated steam variant

Bavarian S 3/5 H
DRG Class 17.5
Type and origin
BuilderMaffei
Build date1906–1911
Total produced30
Specifications
Configuration:
 • Whyte4-6-0
Axle load16.0 t (15.7 long tons; 17.6 short tons)
Adhesive weight48.0 t (47.2 long tons; 52.9 short tons)
Service weight71.9 t (70.8 long tons; 79.3 short tons)
Superheater:
 • Heating area33.90 m2 (364.9 sq ft)
High-pressure cylinder360 mm (14.173 in)
Low-pressure cylinder590 mm (23.228 in)
Performance figures
Indicated power925 kW (1,240 hp)
Career
NumbersBavarian 3329, 3341-3369
DRG 17 501–524
Retiredby 1948
data shown where different

For the 1906 Bavarian State Exhibition in Nuremberg, Maffei fitted locomotive no. 3329 experimentally with a Schmidt superheater. In addition the bore of the cylinders was increased to 360 mm (14.173 in)/590 mm (23.228 in). These measures produced a significant improvement in locomotive performance (450 tonnes or 440 long tons or 500 short tons on the level at 100 km/h or 62 mph), so that from 1908 the Bavarian state railways only ordered the superheated S 3/5 H.

Although the more powerful S 3/6 express locomotive had been available since 1908, the number of S 3/5 H engines had climbed to 30 by 1911, partly because there was insufficient funding for the expensive S 3/6. As a result, the overall number of S 3/5 engines was 69.

Reichsbahn

After World War I, 19 saturated steam and 6 superheated steam locomotives had to be transferred abroad. Seventeen of those went to the French Eastern Railway, five to the AL and two to the Belgian state railway. Locomotive no. 3333 was left in Poland after the war and was numered by the PKP as Ok 103-1.

The Deutsche Reichsbahn took over the remaining 20 saturate steam engines as Class 17.4 (17 401–420) and had them converted to superheated locomotives in 1925. The remaining 24 superheated engines became Class 17.5 (17 501–524). In the meantime the S 3/5 was mainly used on passenger train duties in the Reichsbahndirektionen of Augsburg and Nuremberg, because enough modern express engines were now available.

The Reichsbahn began to retire the locomotives as early as 1932. Initially the older, former saturated steam engines disappeared, only eight examples remaining after the Second World War; whilst at the same time 21 of the former S 3/5 H locomotives were still working. All the engines were in Bavaria by the end of the war, but were heavily worn out and no longer ran in regular service. Both variants were finally retired by 1948.

See also

Sources

  • Weisbrod; Müller, Manfred; Petznick, Wolfgang (1976). Dampflokomotiven Deutscher Eisenbahnen Baureihe 01-39. Düsseldorf: Alba. ISBN 3-87094-081-6.
  • von Welser, Ludwig; Huschläger, Helge (2001). Bayern-Report. Band No. 9. Fürstenfeldbrück: Merker. ISBN 3-89610-081-5.