Tr20

 

Tr20_2

 

Tr20-59, photographed at the Lublin depot in October 1962. Photo from my collection.

 

Tr20_3

 

Factory photo of a Pershing class locomotive; National Railroad Museum (USA) collection.

 

Tr20_1

 

CFR 140.117, preserved at the Sibiu depot. Photo by Adrian Raduta (thanks for permission!).

 

 Tr20_sc

 

Tr20 side drawings by Marek Ćwikła (source: SK vol.12/2008). Upper drawing shows the original version, lower – with modification (Tr20-151 through 175).

 

 

Ex-USATC 396, operated by Texas State Railroad. Photo by Gary Snook (courtesy Chaz Robitaille).

 

 

Preserved No. 101 at the National Railroad Museum, Green Bay, USA. Photo taken on April 17, 2011, by Hugh Llewellyn (source: www.commons.wikimedia.org).

After WWI Polish railways took over a number of German, Austrian and Russian locomotives, but most of them were old and obsolete machines running on saturated steam. Those suitable for heavy freight traffic included primarily Prussian class G10 (re-classed Tw1 in the PKP service), of which 35 were taken over from KPEV and twenty from Austrian military railways; further thirty were built by Schwartzkopff against Polish order. These engines had the tractive effort of 15.2 tonnes. Other types with comparable performance were usually represented by single examples and indigenous Tr21 (designed in co-operation with Austrian StEG) appeared only in 1922. Soon it became evident that coal transportation and export would be of vital importance for national economy, which obviously resulted in heavy drafts, so there was an urgent need for a powerful freighter.

Brand new engines could be readily supplied by American manufacturers. Among them, Baldwin Locomotive Works had already become the largest locomotive builder in the world. In July 1917, after USA had entered WWI, U.S. Army Transportation Corps (USATC) placed an order for 150 1-4-0, or Consolidation, engines, factory type 10-36-E, to be used in Europe by British Army (Railway Operating Division). They had many European features, in particular cabs, but generally represented the American design school. In August 1918, the second order was placed with Baldwin for further 510 identical engines and total output eventually reached about 2000 examples. SK gives 2019, but detailed study of available sources (many thanks to Piotr Staszewski) yields 1840 engines for U.S. Army, 25 for French government, six for U.S. Navy and 100 supplied directly to French Compagnie de Chemins de Fer de Paris à Lyon et à la Méditerranée (PLM) – 1971 in all. Monograph by Tomasz Roszak (see References) gives higher number of locomotives built for U.S. Army – 1915. The above total does not include engines built for Poland and Romania – see below. In 1918 U.S. Army began referring to them all as the Pershing class, in honor of Gen. John J. Pershing, the AEF commander. After the war, the majority of these locomotives – 1816 – went to various French companies. Apart from PLM, they were used by Alsace-Lorraine (AL), Est, Etat, Midi, Nord and Paris-Orléans (PO) and it seems doubtful whether any was eventually shipped back to the USA (most probably two engines remained there in the USATC service). After various French railway enterprises were merged into Société Nationale des Chemins de Fer Français (SNCF) in 1938, they continued with the new company. They were classed 140, but this class included also other locomotives with the 1-4-0 axle arrangement, both of American (Baldwin and ALCO) and French origin. During the war French engines were scattered throughout the entire part of Europe under German control. Details are lacking, but it seems probable that over 300 ex-French 140s saw service with Ostbahn in Poland. Some of them were not evacuated and were taken over by PKP. In late 1940s over 130 French 140s were awaiting return to their homeland, but no international agreement was reached and most of them were scrapped in 1950s. It seems almost certain that a few Pershings from SNCF were briefly used by PKP immediately after the war, but no details are available.

Another recipient of Pershings was Romania. In all, Romanian railways CFR acquired 65 examples. Of these, 140.101 through 140.115, from wartime Baldwin production, were presented by French authorities in 1919, together with 48 ex-KPEV engines. In April 1920, CFR purchased further fifty engines: 140.116 through 140.140 (built by Baldwin) and 140.141 through 140.165 (built by Montreal Locomotive Works, an ALCO subsidiary). They differed in having rocking grates and provisions for mixed coal/oil firing. Steam engine cylinder bore/piston stroke was 584/660 mm (i.e. 23’/26’), compared with 21’/28’ of the original Baldwin design, which of course resulted in higher tractive effort of 15.9 tonnes. Apart from five written off after accidents, all CFR engines were still in service in late 1953. Most were withdrawn between 1970 and 1973 and the last one was 140.105 (ex USATC 1664, Baldwin 50433/1918), withdrawn in September 1977 and formally written off in October 1979.

Polish government did not buy surplus U.S. Army engines, although such option was contemplated. Instead, in July 1919, 150 brand new ones were ordered from Baldwin. They were supplied in a few batches (serial numbers in the range from 52421/1919 to 53313/1920) and assembled at the Troyl-Werke (a division of The International Shipbuilding and Engineering Co. Ltd.) in Gdańsk, first twelve arriving in December 1919. Initially they were given service numbers 6001 through 6150; later, in accordance with new designation system introduced in 1922, they were re-numbered Tr20-1 through 150. In 1922 additional 25 engines were ordered and supplied, with serial numbers in the range from 55695/1922 to 55868/1922. They differed in some details and externally could be distinguished by higher cabs, extended smokestacks and tenders with higher side walls. Ten were fitted with steel fireboxes. Due to these differences, the second batch was initially considered a new class, numerical designations 7001 through 7025 being initially assigned, but in fact all engines were re-numbered Tr20-151 through 175 even before delivery.

Baldwin locomotives, compared to their nearest equivalent then in the PKP service – the above-mentioned class Tw1 – were only marginally heavier, but longer by over one metre, mainly due to larger tender. Smaller cylinder bore was to some extent compensated by higher steam pressure, but tractive effort was slightly lower, as Tr20 had four coupled axles instead of five. Maximum axle load was substantially higher, by over two tonnes. Powerful and robust engines, Tr20s were accepted by Polish railwaymen with sheer enthusiasm. Some of them, immediately after delivery, were sent eastwards, as they were badly needed during the fight against the Bolshevik assault. Despite harsh conditions, poor water quality and insufficient maintenance facilities they gave good performance. Tr20s were, however, not entirely trouble-free. Some items in the driver’s cab obstructed forward view and axle bearings often overheated. There were several other minor problems, but two shortcomings were found particularly serious. Fairly soon it was revealed that rear boiler tube wall was rather weak and prone to distortion and fatigue cracks. Connection between water box and tender frame was also too weak, so a head-on collision usually resulted in water box being rammed into the driver’s cab, which was often fatal for the footplate crew. It seems that the above-mentioned shortcomings were, at least to some extent, caused by hurried development and production rather than basic design flaws. First order from USATC for 150 engines was placed on July 17 and completed by October 1, 1917; during late 1917 and early 1918 Baldwin were producing almost 300 Consolidations for USATC per month.

Tr20s were later supplemented by indigenous Tr21s with similar overall characteristics (tractive effort of 14.4 tonnes with maximum axle load of 17 tonnes). With gradual introduction of Ty23s, which soon dominated heavy freight traffic, both these classes were relegated to secondary lines and later to switching, but most probably all 175 Tr20s remained in service until 1939. Their good service during the war against Bolsheviks must have impressed military authorities, as shortly before WWII it was intended to fit all of them with car heating installations, so that they could haul military trains (with officers’ cars usually right behind the engine!). At least two, Tr20-140 and Tr20-154, were in fact fitted with such installations by Troyl-Werke. According to LP and SK, which give the most comprehensive information on individual examples, after the September campaign 98 engines were impressed into DRG as class 5637-38; 66 went to the Soviet Union and were taken over by NKPS. One (Tr20-36) was taken to Lithuania, to fall into Soviet hands in 1940. There is no reliable data on the remaining ten examples, but most probably they were also captured by the Soviets. Two German engines, badly damaged during hostilities (Tr20-103 and Tr20-168) were written off in 1940. 59 Soviet engines were later captured by the Germans and also impressed into the DRG service. In 1940, Polish boiler works Babcock-Zieleniewski (renamed Ferrum-Werk Sosnowitz) built seven replacement boilers for Tr20s; they differed in distance between tube walls shortened by 19 mm (due to tube wall strengthening), which resulted in heating surface reduction by 1.3 sq.m.

After 1945, 88 ex-DRG Tr20s were directly returned to PKP, plus six more that had seen brief service in Yugoslavia (2) and Austria (4). Czechoslovakian railways took over six examples, of which three were given ČSD service numbers: 437.2500 (Tr20-38), 437.2501 (Tr20-83) and 437.2502 (Tr20-125). First was sold to industry in 1958 and second was scrapped in 1961. The remaining three saw no service with ČSD. Two of them, together with 437.2502, were returned to PKP between 1947 and 1949; data on the third is lacking. Tr20-145, taken over by Soviet military authorities in Eastern Germany, but probably not restored in service, was returned in 1949. Tr20-87, formally taken over by Ostbahn, but with no service record, was rebuilt from a wreck after the war. The most mysterious post-war Tr20 is Tr20-99, possibly also taken over as a wreck, but with unknown identity; formally included in rosters, it saw no service and was written off in 1951. DB kept 23 Tr20s, scrapped in early 1950s; of fifteen taken over by DR, all but one were returned in 1955 and 1956, but their condition was very poor and they were scrapped with no new service numbers assigned.  Thus, in all, 100 Tr20s were given PKP service numbers after WWII, but some were written off in late 1940s or early 1950s. According to rosters quoted in SK, this class numbered 88 examples in October 1946, 96 in July 1949 and 86 in January1955. As rapid electrification had been envisaged, Tr20s, together with other older classes, were intended for rapid withdrawal. These plans had to be modified fairly soon: 43 Tr20s still remained in service in early 1965. This engine, however, remained a troublesome one. Boiler material ageing forced costly repairs and steam engine cylinder fractures were commonplace. Eight examples survived until 1974 and the last one, Tr20-95 (pre-war Tr20-133, Baldwin 53016/1920), was finally withdrawn in November. Unfortunately, not even a single example managed to escape the cutter’s torch.

As far as I know, three Pershings have survived until today. One engine from the first batch of 150 (USATC No.8341, built in 1917), which had not been sent to France, saw some service at Ft. Monroe, VA, and was rebuilt in 1925. Withdrawn in 1945, it was sent to Korea in 1947 along with 100 engines acquired from Europe – hence its new number, No.101. It was returned by the authorities of the Korean Republic in 1959 and can now be seen at the National Railroad Museum, Green Bay, WN. The other surviving Pershing is CFR 140.117 (Baldwin 53343/1920), which has been preserved in Sibiu. It underwent a major overhaul in 2004 and saw some service with special trains; possibly it is still in working order. Third example is ex-USATC 396, later re-numbered 20 and sold to Tremont & Gulf Railway. Again re-numbered 28, it was later sold to Temple Industries and was operated until 1957 by its subsidiary, Southern Pine Lumber Company. Donated in 1976 to Texas State Railroad  of Rusk, Texas, it was initially placed on static display. Restored to the working order in 1992, it is still operational and runs with tourist trains (many thanks to Chaz Robitaille for information and details!).

 

 


Main technical data

 

No.

Parameter

Unit

Value

1.

Years of manufacture

-

1919 – 1922

2.

Total built / used in Poland

-

1753) / 175

3.

Tender class

-

21D20

4.

Axle arrangement

-

1-4-0

5.

Design maximum speed

km/h

65

6.

Cylinder bore

mm

2 ´ 5332)

7.

Piston stroke

mm

7112)

8.

Engine rating

kW/hp

 

9.

Tractive effort

kG

14 000

10.

Boiler pressure

MPa

1.38

11.

Grate dimensions

m X m

3.108 X 0.952

12.

Firebox heating surface

m2

15.84

13.

Distance between tube plates

mm

4 158 (4 139)1)

14.

Number of flue tubes

-

165

15.

Heating surface of flue tubes

m2

90.85 (90.0)

16.

Number of smoke tubes

-

26

17.

Heating surface of smoke tubes

m2

42.5 (42.2)

18.

Evaporating surface, total

m2

157.34 (156.3)

19.

Superheater heating surface

m2

39.0

20.

Diameter of drivers

mm

1420

21.

Diameter of idlers front/rear

mm

820 / -

22.

Total weight, empty

kg

69 300

23.

Total weight, working order

kg

75 600

24.

Adhesive weight, working order

kg

67 200

25.

Weight with tender, empty

kg

96 300

26.

Weight with tender, working order

kg

130 600

27.

Maximum axle load

T

17.5

28.

Axle base (with tender)

mm

17 486

29.

Overall length (with tender)

mm

20 083

30.

Brake type

-

Westinghouse

 

1)      Data in brackets for replacement boilers.

2)      Some sources give ‘rounded-up’ figures: bore 535 mm, stroke 715 mm.

3)      Refers to Polish order only.

 

References and acknowledgments

 

-       Monographic article by Tomasz Roszak (SK vol. 12/2008);

-       LP, ITFR, RR, EZ vol.3;

-       Private communication: Tamas Haller (Romania), Robert J. Lettenberger (USA), Tim Moore (USA), Adrian Raduta (Romania) and Chaz Robitaille (USA);

-       Piotr Staszewski (also private communication – many thanks for very throughout and detailed study on the production and service of ‘Pershings’, which allowed me to correct a number of errors in this entry).