BHStB IIa4

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BHStB / BHLB / SHS IIa4
kkBB IIa4
JDŽ / JŽ 178
KkBB IIa4 201.jpg
Number: 8th
Manufacturer: Krauss / Linz
Year of construction (s): 1894-1896
Type : 1'B1'n2v
Gauge : 760 mm ( Bosnian gauge )
Total wheelbase: 4.5 m
Service mass: 21.3 t
Friction mass: 12.3 t
Top speed: 60 km / h
Starting tractive effort: 20.4 kN
Coupling wheel diameter: 1100 mm
Impeller diameter: 650 mm
Cylinder diameter: 290/430 mm
Piston stroke: 450 mm
Boiler overpressure: 12 atü
Grate area: 1.2 m²
Evaporation heating surface: 62 m²
Tender: Tender
Service weight of the tender: 12.6 t
Water supply: 5 m³
Fuel supply: 3 t

The vehicles of the series IIa4 were narrow-gauge train tender - locomotives of the kuk Bosnabahn (kkBB) and the Bosnian-Herzegovinian State Railways (BHStB).

history

For the development of the areas of Bosnia and Herzegovina occupied by Austria from 1878 onwards , narrow-gauge railways with the so-called Bosnian gauge were built . Curve-moving locomotives with Klose steering axles were used on the demanding routes with tight curve radii . The first 34 machines were twin locomotives with simple use of steam expansion and were designated as series IIIa4 . In order to improve the economy and increase the speed, the Bosnabahn and the BHStB decided to purchase series IIa4 locomotives .

From 1895 to 1894 Krauss delivered seven IIa4 express train locomotives to the BHStB in Linz , after the Bosnabahn had already received the same machine a year earlier. The machines had a 1'B1 'wheel arrangement like the Orlèans type of the State Railway Company .

The Yugoslav State Railways (JDŽ) designated the machines as the 178 series. Most of the machines remained in operation until the 1950s. At least one copy was also used on a pioneer railway in Ljubljana .

Constructive features

BHStB IIa4 105 as 178-005 for the JDŽ .

The locomotives had a compound drive with two internal cylinders. On the two coupling axles there were 200 millimeter wide wheels without flanges . The track was guided by the front and rear running axles, which were designed as Klose steering axles and were adjusted radially by the two-axle tender.

The locomotives had outer frames and inner cylinders overhanging the barrel axis. Flat slide valves took over the steam distribution via an Allan control . The standing boiler sagged behind the coupling axles between the frame cheeks.

With a top speed of 60 km / h, the IIa4 series were the fastest narrow-gauge locomotives in the world. However, due to the low demand, express trains were initially abandoned.

Locomotive list

Construction year Manufacturer Bosnabahn
number		 BHStB no. from 1895
BHLB no. from 1908
SHS no. from 1918		 JDŽ no.
from 1933		 Remarks
1894 Krauss Linz 201 101 discarded before 1932
1895 Krauss Linz 102 178-002
103 178-003 from 1954 Poljčane
from 1958 Ljubljana
discarded in 1961
104 178-004 discarded 195?
1896 Krauss Linz 105 178-005 discarded 195?
106 178-006 discarded 195?
107 discarded before 1932
108 178-001 discarded 195?

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References and comments

  1. ↑ Karl Tindl: Section reports. Specialist group of machine engineers. Report on the meeting of January 31, 1911 with a lecture by Mr. Steffan about the development of locomotive types on the lines of the Bosnian-Herzegovinian state railways. In: Journal of the Austrian Association of Engineers and Architects. Year 1911, issue 22, pages 348–350 (digitized version 1865–1917 at TU Cottbus; PDF; 51.2 MB)
  2. ↑ Keith Chester: Bosnia-Hercegovina Narrow Gauge Album. Stenvalls, Malmö 2010, ISBN 978-91-7266-176-9 . P. 304.
  3. ^ Bosnian-Herzegovinian state railways