RhB G 2/2 + 2/3

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G 2/2 + 2/3
Maloja23G22 + 23RhBi.jpg
Numbering: 23 + 24
Number: 2
Manufacturer: SLM
Year of construction (s): 1896
Retirement: 1926
Axis formula : B'B1 '
Genre : Mallet
Gauge : 1000 mm ( meter gauge )
Length over buffers: 10343 mm
Bogie axle base: 1600 mm
Fixed wheelbase: 1600 mm
Total wheelbase: 6600 mm
Empty mass: 36.5 t
Service mass: 44.5 t
Friction mass: 40.2 t
Wheel set mass : 10.125 t
Driving wheel diameter: 1050 mm
HD cylinder diameter: 330 mm
LP cylinder diameter: 490 mm
Piston stroke: 550 mm
Boiler overpressure: 14 atm.
Number of heating pipes: 139
Heating pipe length: 3600 mm
Grate area: 1.3 m²
Radiant heating surface: 7 m²
Evaporation heating surface: 79 m²
Water supply: 3.4 m³
Fuel supply: 1.2 t (coal)
Control: Walschaert

The G 2/2 + 2/3 is a tank locomotive of the type Mallet , the Rhaetian Railway procured in duplicate 1896th The locomotives were manufactured by the Swiss Locomotive and Machine Factory in Winterthur, and the retail price is 65,500 Swiss francs.

The two locomotives differed from the two G 2 × 2/2 delivered in 1891 by the additional running axle . When re-ordering the eight other Mallet locomotives in 1903, their chassis was rotated so that the design corresponded to the G 2/3 + 2/2 type . The first two locomotives without running axles were also converted to this design.

Technical

The new arrangement of one of the running axles under the driver's cab compared to the two predecessor locomotives was primarily due to the increase in operational stocks. Because the boiler and machine dimensions remained largely the same, only the boiler pressure was increased from 12 to 14 atm . In this connection, the high pressure cylinder diameter decreased. They also wanted to reduce the rather large rear overhang. However, it quickly became apparent that the additional increase in smoothness did not occur, but that the high level of wheel flange and track wear remained. This was the reason why the successor locomotives were built with a leading axle.

The locomotives had an outer frame, the locomotive frame of the rear part was pulled forward and supported the bogie in the middle. The boiler hung over at the front and was thus supported for the last time at the height of the pivot point. The locomotives did not have a pivot, as the ball joint for the steam supply was located at this point. The bogie was rotatably connected to the main frame with journal bearings. In this connection, two buffer springs were installed which, together with the centering springs of the movable sliding plates of the supports, counteracted the rolling of the bogie. The barrel axis was designed in the form of an Adams radial frame . The rear cylinders were the high pressure cylinders that obtained their steam directly from the centrally located steam dome. The front cylinders were fed with the exhaust steam from the high-pressure cylinders. The steam was supplied via fixed pipes, the ball joint of which was arranged in the pivot point. The exhaust steam was led to the blowpipe via a movable exhaust pipe with stuffing boxes. To start up, the low-pressure cylinders could be supplied with throttled live steam. The control of the Walschaerts type was in the same direction for both engines. The locomotives had flying backdrops in pocket design. The control of the two engines was carried out with two overhead control shafts coupled and balanced with an inner rod. The change of direction took place with screw and wheel. With the fully configured control, the throttled supply of live steam to the low-pressure cylinder took place automatically.

List of G 2/2 + 2/3 of the RhB

operation
number		 Installation Factory
number		 Surname Ausran-
Government		 Whereabouts
23 05/30/1893 958 Maloja 1926 Sold to Kraftwerke Oberhasli, scrapped in 1940
24 06/12/1893 959 Chiavenna 1926 Sold to Kraftwerke Oberhasli, scrapped in 1940

Operational

When the order was placed, the specifications stipulated that the locomotives should be able to move a train of 70 tons on an incline of 45 per mille at 15 km / h. This requirement could be met with an output of 500 hp.

The two locomotives were scrapped from the RhB in 1926 and came to the Oberhasli power plants (predecessor company of the Meiringen-Innertkirchen-Bahn ), which they used with the same numbers until 1940 (No. 23) and 1937 (No. 24). At the latest during the Second World War , the locomotives were recycled as scrap metal.

literature

  • Alfred Moser: The steam operation of the Swiss railways 1847-1966 . 4th updated edition. Birkhäuser, Stuttgart 1967, ISBN 3-7643-0742-0 , p. 341 ff . (ISBN of the 6th edition).
  • Claude Jeanmaire: The steam locomotives of the Rhaetian Railway - From the Landquart-Davos Railway to the Rhaetian Railway . Verlag Eisenbahn, Villingen 1974, ISBN 3-85649-022-1 .
  • Gian Brüngger: Steam on the RhB (=  LOKI-Spezial . No. 40 ). Stämpfli Verlag AG, Bern 2016, ISBN 978-3-7272-1787-6 .
  • Wolfgang Finke, Hans Schweers: The vehicles of the Rhaetian Railway: Locomotives, railcars, tractors . In: Wolfgang Finke (Ed.): The vehicles of the Rhaetian Railway, 1889–1996 . tape 3 . Schweers + Wall, Aachen 1998, ISBN 3-89494-105-7 (223 pages, [ limited preview in the Google book search]).