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The reference for locomotives and railcars

Jura-Bern-Luzern G 3/3

Switzerland 1887 16 produced
JS-909 in April 2016 in Saint-Valery-Canal Didier Duforest CC BY-SA 4.0

Starting in 1887, the Bernese Jura Railway (JBL) received ten 0-6-0T tank locomotives from the SLM. They were to be used on the flatter sections of the Brünig Railway and had drivers with a diameter of 1,050 mm. More locomotives of identical or similar design were bought by other railways: three by the Bière-Apples-Morges Railway (BAM), one by the Apples-L’Isle Railway (AL) and two by the Montreux Oberland Bernois Railway (MOB).

Since the locomotives of the MOB had to climb grades of 7.3 percent, their drivers measured only 950 mm, while the boiler pressure had been increased from 10 to 12 bars. Additionally, locomotives of the different operators had different sanders and brakes. After one JBL locomotive had been sold to the BAM in 1921, three of the now four BAM locomotives were superheated. 

Two of the MOB locomotives were sold to Luxembourg in 1906 and 1918. Depending on the operator, the locomotives were withdrawn between 1911 and 1956. Today, the locomotive that has been sold to the BAM in 1921 is still operational at the Blonay-Chamby heritage railway. It is running either with the BAM number 6 or Jura-Simplon number 909.

Technical data

General

Property standard variant superheated MOB variant
Built 1887-1901 1921-1926 1903
Manufacturers SLM
Wheel arrangement 0-6-0T (Six-coupled)
Gauge 1,000 mm (Meter gauge)

Dimensions and weights

Property standard variant superheated MOB variant
Length 6.97 m 7.02 m
Wheelbase 2.50 m
Service mass 18.6 t 20.2 t
Adhesion mass 18.6 t 20.2 t
Rigid wheelbase 2.50 m
Water capacity 2,600 l
Fuel capacity 0.5 t (coal)

Boiler

Property standard variant superheated MOB variant
Grate area 0.8 m²
Evaporative heating surface 56.4 m² 50.2 m² 56.4 m²
Total heating surface 56.4 m² 60.4 m² 56.4 m²
Superheater surface 10.2 m²

Power plant

Property standard variant superheated MOB variant
Driver diameter 1,050 mm 950 mm
Boiler pressure 11 bar 12 bar
Expansion type simple expansion
Cylinders two, 310 x 480 mm

Power

Property standard variant superheated MOB variant
Power source steam
Indicated power 132 kW (179 PS) 147 kW (200 PS)
Top speed 45 km/h 35 km/h
Starting effort 41.1 kN 44.8 kN 49.5 kN

Calculated values

Property standard variant superheated MOB variant
Factor of adhesion 1 : 4.44 1 : 4.07 1 : 4.00
Optimal speed 19 km/h 18 km/h
Power-to-weight ratio 7.1 kW/t 7.9 kW/t 7.3 kW/t
Adhesive weight/Total 1 : 1.00
Tractive force/Heating surface 1 : 15.21 1 : 15.50 1 : 18.34
Grate area/Heating surface 1 : 70.50 1 : 75.50 1 : 70.50
Total/Superheater 1 : 4.92
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