Tr105

SäSt 768 (Hartmann 2863/1904), 1919, location unknown. Re-numbered 56 506 by DRG, this locomotive was withdrawn in 1926. Source: Lokomotiv-Archiv Sachsen 2 (see References).  

Side drawing of the XI V, second batch; source: as above.

The very existence of this class is uncertain. According to some sources this designation was assigned to former Sächsische Staatsbahn (SäSt) class IX V, but this is not confirmed by any official document.

Basically SäSt class IX V numbered 22 examples, but last two (service numbers 1281 and 1282) were in fact Austro-Hungarian class 170 engines, built against kkStB order by Krauss Linz in 1919, purchased directly from manufacturer and sold to ÖBB in 1922. Class IX V ‘proper’ comprised twenty locomotives built by Hartmann in three batches: two in 1902 (service numbers 751 and 752), nine in 1904 (753 through 761) and nine in 1906 (762 through 770). There were minor differences between individual batches, but all ran on saturated steam and were fitted with compound steam engines. Their characteristic features were rear Klien-Lindner axle that allowed for negotiating tight curves and left space for a large Belpaire-type firebox, as well as long steam collection pipe of considerable diameter above the boiler. Class IX V was basically intended to replace older and weaker class I V freight Mallets on demanding tracks. These engines were typically coupled with three-axle 3T9, 3T12 or 3T13 tenders. Later they were developed into class IX HV with steam superheating.

Sixteen engines of this type were taken over by newly-formed DRG and classed 56⁵. Their service with the new owner was, however, very short, as all were written off until 1926. The remaining four (service numbers 753, 755, 763 and 770) were probably taken over by PKP and later classed Tr105, but – as already mentioned – confirmation is lacking. Lokomotiv-Archiv Sachsen 2 (see References) lists them as ‘lost in the East during WWI’. Virtually nothing is known about their service in Poland, apart from the fact that all were withdrawn before 1927. No locomotive of this type has been preserved.

Main technical data

No.	Parameter	Unit	Value
1.	Years of manufacture	-	1902 – 1906
2.	Total built / used in Poland	-	20 / 4
3.	Tender class	-
4.	Axle arrangement	-	1-4-0
5.	Design maximum speed	km/h	65
6.	Cylinder bore	mm	530 / 770
7.	Piston stroke	mm	630
8.	Engine rating	kW/hp
9.	Tractive effort	kG
10.	Boiler pressure	MPa	1.43
11.	Grate dimensions	m X m	3.2 m^2
12.	Firebox heating surface	m^2	12.2
13.	Distance between tube plates	mm	4 600
14.	Number of flue tubes	-	259
15.	Heating surface of flue tubes	m^2	168.4
16.	Number of smoke tubes	-	-
17.	Heating surface of smoke tubes	m^2	-
18.	Evaporating surface, total	m^2	180.6
19.	Superheater heating surface	m^2	-
20.	Diameter of drivers	mm	1 240
21.	Diameter of idlers front/rear	mm	1 065 / -
22.	Total weight, empty	kg	64 800
23.	Total weight, working order	kg	72 000
24.	Weight on drivers, working order	kg	60 000
25.	Weight with tender, empty	kg
26.	Weight with tender, working order	kg
27.	Maximum axle load	T	15.0
28.	Axle base (with tender)	mm	13 940 / 13 893^1)
29.	Overall length (with tender)	mm	17 410 / 17 516^1)
30.	Brake type	-	Steam, later Westinghouse

1) With the 3T9 tender; first batch / second and third batch.

References and acknowledgments

- Lokomotiv-Archiv Sachsen 2 by F.Näbrich, G.Meyer and R.Preuss (Transpress, Berlin, 1984);

- LP;

- www.de.wikipedia.org;

- www.beitraege.lokomotive.de (locomotive database by Ingo Hütter);

- Charakterystyka parowozów (Steam Locomotive Characteristics) by A. Czeczott (Ministry of Transport, 1927).