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Prussian P 42
German Reichsbahn class 360-4
Germany | 1889 | 707 produced
P 4<sup>2</sup> of the standard variant
P 42 of the standard variant
Die Lokomotive, August 1910

The first two examples of the P 42 came from the series of eight trial locomotives that were already described in the article of the P 41. In contrast to the latter, they were powered by a two-cylinder compound engine, but otherwise they were largely identical.

Similar to the P 41 of the Erfurt variant, two P 42 of the Erfurt variant were built, which were delivered by Henschel in 1891 and took part in the testing of the different types. Since at that time there were still massive starting problems with compound engines with two cylinders, priority was given to the simple engines despite their poorer efficiency, so that no further P 42 of the first type were manufactured.

P 4<sup>2</sup> of the Erfurt variant
P 42 of the Erfurt variant
Die Lokomotive, August 1921

The problems could be solved after the Union foundry in Königsberg invented the Dultz starting device, which enabled the vehicle to start in any wheel position. Thus, in 1898, the production of a normalized design began, of which a total of 707 examples were to be built by 1910. Despite the only slightly increased weight, these were not only more economical than the P 41, but also more powerful.

Like its predecessor, the P 42 was used in front of express trains, especially in the early days, but was later pushed out of this role by new locomotives. Mecklenburg, Oldenburg and the Lübeck-Büchener Eisenbahn also procured these locomotives, although the latter had ordered a variant with a shortened wheelbase. These reached quantities of 31, eight and five.

Of the 549 engines recorded in 1923, 437 were taken over by the Reichsbahn in 1925 and assigned the numbers 36 002 to 36 438. Most examples were retired by the start of World War II, but some returned from eastern areas during the war. Of the locomotives which survived the war, one was equipped by the Reichsbahn with coal dust firing and received a four-axle tender with 30 m³ of water. It was only retired in 1959 and was thus the last P 42.

VariantErfurt variantstandard variant
General
Built18911889-1910
ManufacturerHenschelHenschel, Humboldt, Linke
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length51 ft 2 3/4 in57 ft 9 3/8 in
Wheelbase24 ft 3 5/16 in
Fixed wheelbase8 ft 8 5/16 in
Total wheelbase48 ft 3 1/8 in
Empty weight95,019 lbs100,641 lbs
Service weight107,145 lbs112,766 lbs
Adhesive weight62,391 lbs66,469 lbs
Axle load31,195 lbs33,246 lbs
Water capacity3,170 us gal3,963 us gal
Fuel capacity11,023 lbs (coal)
Power
Power sourcesteam
Indicated power590 hp (440 kW)573 hp (427 kW)
Optimal speed35 mph32 mph
Top speed56 mph
Starting effort10,656 lbf11,410 lbf
with start valve12,787 lbf13,692 lbf
Power Plant
Driver diameter68.1 in68.9 in
Boiler pressure174 psi
Expansion typecompound
Cylinderstwo, HP: 17 5/16 x 23 5/8 in
and LP: 26 x 23 5/8 in
two, HP: 18 1/8 x 23 5/8 in
and LP: 26 3/4 x 23 5/8 in
Boiler
Grate area24.8 sq ft
Firebox area96.9 sq ft
Tube heating area1,248.6 sq ft1,173.3 sq ft
Evaporative heating area1,345.5 sq ft1,270.1 sq ft
Total heating area1,345.5 sq ft1,270.1 sq ft
Calculated Values
steam locomotive
passenger
last changed: 01/2022
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