BHStB IIIa4

BHStB / BHLB / SHS IIIa4 kkBB IIIa4 JDŽ / JŽ 189
BHStB IIIa4 in 1965 as JŽ 189-013 in Sarajevo
Number:	34
Manufacturer:	Krauss
Year of construction (s):	1885-1896
Type :	C1't
Gauge :	760 mm ( Bosnian gauge )
Length over coupling:	9.234 m
Total wheelbase:	6 m
Service mass:	25.6 t
Friction mass:	19.2 t
Top speed:	50 km / h
Starting tractive effort:	49 kN
Coupling wheel diameter:	900 mm
Impeller diameter:	650 mm
Cylinder diameter:	290 mm
Piston stroke:	450 mm
Boiler overpressure:	12 atü
Grate area:	0.9 m²
Evaporation heating surface:	58.2 m²
Tender:	Supporting tender
Water supply:	2.7 m³
Fuel supply:	2 t

The IIla4 series were Klose support tender locomotives with three coupling axles and Klose steering mechanism in Bosnian gauge of the Bosnian-Herzegovinian State Railways (BHStB, from 1895) and their two predecessors, the Bosnian-Herzegovinian State Railways (BHStB, 1884 to 1895) and the kuk Bosnabahn (kkBB, 1879 to 1895). Similar locomotives procured the Royal Saxon State Railways as a genus III K .

history

BHStB IIIa4 203 (undated)

For the development of the areas of Bosnia and Herzegovina occupied by Austria from 1878 onwards by the Berlin Congress , narrow-gauge railways with 760 mm gauge were built, which, due to the difficult terrain, had steep gradients and narrow curves with radii of up to 33 meters. The two-axle tank locomotives were no longer able to cope with the steadily increasing traffic. The demanding track conditions led to the development and procurement of locomotives with Klose steering axles , which impressed with their good arc travel.

In 1885 the Munich plant of the Krauss & Co. company developed a three-coupling locomotive with a single-axle support tender for the Bosnabahn. The machine built in the Krauss plant in Linz proved its worth and the Krauss plant in Linz delivered another 33 identical vehicles to the Bosnabahn and BHStB between 1887 and 1896.

technical features

The type sketch shows the complicated mechanism of the Klose steering gear .

The machine had an outer frame and inner cylinder with external slide boxes for Stephenson - control . The radial adjustment of the first and third coupling axles took place via the support tender, which also carried the coal bunker. The water supplies were taken in side boxes.

The two outer of the three coupled axles were designed as Klose steering axles. They were adjusted radially by the movements of the single-axis Klose support tender , which rotated around a pin in front of the fire box , using a lever mechanism. This resulted in the locomotive being able to move freely in curves (contemporary curve movement). The lengthening and shortening of the coupling rod caused by the radial adjustment of the two outer wheel sets was carried out using a so-called differential head. It was located above the central coupling axle and was connected to the axle bearings of the steering axles with a parallelogram link. The angle of the differential head changed depending on the rotation of the steering axles, resulting in the right length of the coupling rod.

Despite the multi-part drive and running gear, the locomotives have proven themselves well, so that additional locomotives with Klose steering axles have been ordered.

Locomotive list

Construction year	Manufacturer	kkBB - number	BHStB no. until 1895	BHStB no. from 1895 BHLB no. from 1908 SHS no. from 1918	JDŽ no. from 1933	Remarks
1885	Krauss Linz	21st		201	189-001	1919–1920 Usora Valley Railway
1887	Krauss Linz	22nd		202	189-002	from 1949 Slovenske Konjice
		23		203	189-003	1919–1920 Usora Valley Railway
		24		204	189-004
		25th		205	189-005
1888	Krauss Linz		4, then 31	206		discarded before 1933
		26th		207	189-007	Zenica ironworks , then Elektrobosna Jajce
1889	Krauss Linz	27		208	189-008
		28		209	189-009	Zenica ironworks
			5, then 32	210	189-010
1890	Krauss Linz	29		211	189-011	Kakanj mine
1891	Krauss Linz	30th		212	189-012
		31		213	189-013	1919–1920 Usora Valley Railway
		32		214	189-014
1892	Krauss Linz	33		215	189-015
		34		216	189-016	from 1954 Jablanica hydropower plant
			33	217	189-017	1919–1920 Usora Valley Railway
			34	218	189-018	discarded before 1945
1893	Krauss Linz		35	219	189-019	PDI Sebešić, Bila Nova
			36	220	189-020
			37	221	189-021	PDI Janj
		35		222	189-022
		36		223	189-023
		37		224	189-024
		38		225	189-025
		39		226	189-026
1894	Krauss Linz		38	227	189-027
1895	Krauss Linz			228	189-028
				229	189-029
1896	Krauss Linz			230	189-030
				231	189-031	from 1958 Kakanj mine
				232	189-032
				233	189-033
				234	189-006

swell

• Raimar Lehmann: Steam locomotive special designs . Springer, Basel, ISBN 978-3-0348-6757-3 .
• Johann Rihosek : The locomotives of the Bosnian-Herzegovinian state railways . Reprint 2006, Vienna.
• Josef Pospichal: Locomotive statistics. JDŽ 189.Retrieved February 1, 2016 . 
• Franz Pfeuffer: About the construction and operation of the Bosnian-Herzegovinian state railways, especially the rack railway between Sarajevo and Konjica In: Journal of the Austrian Association of Engineers and Architects . Year 1892, issue 22, page 333ff. (Digitized 1865–1899 at TU Cottbus, PDF; 18.3 MB).
• The KK Bosna Railway in its development 1878–1888. Verlag der KK Bosna-Bahn-Direktion, Sarajevo, September 10, 1889, pp. 46–49 , accessed on April 8, 2016 (archived in the Bavarian State Library's image search). 
• Werner Schiendl : The railways in Bosnia and Herzegovina 1867-1918 . Edition Bahn im Film, Vienna 2014. ISBN 978-3-9503096-5-2 .

Remarks

1. ↑ ^{a b} The first machine was delivered to Lehmann in 1884.
2. ↑ Bosnian-Herzegovinian State Railways
3. ↑ Bosnian-Herzegovinian state railway s
4. ^ Bosnian-Herzegovinian state railways