AB G 4/5

G 4/5
Numbering:	FROM 7 + 8 CFE 101 + 102
Number:	2
Manufacturer:	Esslingen / SLM
Year of construction (s):	1908, 1910
Retirement:	(1937 sale, conversion) 1949/50 (demolition)
Axis formula :	1'D
Gauge :	1000 mm ( meter gauge )
Length over buffers:	7310 mm
Fixed wheelbase:	2150 mm
Total wheelbase:	3900 mm
Empty mass:	18.7 t
Service mass:	24.7 t
Friction mass:	21 t
Top speed:	35 km / h
Indexed performance :	500 hp
Starting tractive effort:	6300 kp
Coupling wheel diameter:	900 mm
Cylinder diameter:	310
Piston stroke:	450
Boiler overpressure:	11 atm. (up to 1902 10 atm.)
Number of heating pipes:	123
Heating pipe length:	2850 mm
Grate area:	0.7 m²
Radiant heating surface:	4.8 m²
Evaporation heating surface:	54.4 m²
Water supply:	2.5 m³
Fuel supply:	1.2 t
Locomotive brake:	Westinghouse back pressure brake
Train brake:	Westinghouse
Speedometer:	Hasler

The Appenzellerbahn ( AB ) procured 1908 and 1910 each have a hot steam - Tenderlokomotive the type G 4/5 . The first locomotive was built according to SLM plans by Maschinenfabrik Esslingen , the second by Lokomotivfabrik Winterthur (SLM); they do not differ in the main dimensions. The purchase price is stated at CHF 35,000 for No. 7 and CHF 32,200 for No. 8.

Technical

G 4/5 7 “Altmann” in Herisau station

There were severe technical restrictions during construction due to the route . Thus were boiler - and engine dimensions smaller than the G 4/5 of Rhätischen web. The axle pressure was limited to 8 t and the vehicles had to be able to travel a minimum radius of 84 meters. That is why the rearmost coupling axle was installed so that it could move laterally; the second coupling axle could also be moved sideways. The third coupled axle was the drive wheel . The locomotives were two-cylinder superheated steam tank locomotives with external controls . The boiler pressure of the first locomotive was only 10 Atm., But in 1902 it was 11 Atm. increase. With its output of 500 hp , it more than doubled the output of its predecessors G 3/3 and G 3/4 .

business

G 4/5 with a mixed passenger and freight train in Gontenbad

A G 4/5 was always used from Appenzell . It led the first morning train to Gossau and the last evening train back to Appenzell. If both machines were available, one machine began and ended in Herisau . Only one of the two machines was used in winter. The trailer load on a 38 per mille gradient was 85 tons. In 1924 the top speed was increased from 30 to 35 km / h and in 1931 to 40 km / h.

Whereabouts

Before being sold to Ethiopia, the SLM fitted the two locomotives with a tender.

The two locomotives became superfluous after the railway line was electrified in 1933 and could be sold to the Ethiopian Railway to Ethiopia in 1937 ; for this they were rebuilt at SLM. Because of the weak superstructure , the axle load had to be reduced, which was achieved by converting it to a tender locomotive . They received a new four-axle tender and the driver's cab was also adapted to the new conditions. They were given the numbers 101 and 102. How long they were there is unknown. As the successor to the diesel locomotives of the M series but was not delivered until 1950, to accept them as Ausrangierdatum earliest the 1950s.

List of G 4/5 of the Appenzeller Bahn

Company number	Surname	Factory number	Construction year	factory	over- superheater	discarded
7th	Altmann	3472	1908	Esslingen	from new	1937
8th	Säntis	2093	1910	Winterthur

swell

• Alfred Moser: The steam operation of the Swiss railways 1847-1966. 4th updated edition, Birkhäuser, Stuttgart 1967. P. 349 ff.
• Hans Waldburger: Appenzeller Bahn (AB) 1875 - 1988 (Part 6) ( Memento from February 19, 2005 in the Internet Archive ) On: Website of the Swiss Amateur Railway Club Zurich (SEAK) , 2000. ( Memento from October 25, 2007 in the Internet Archive )

Individual evidence

1. ^ Alfred Moser: The steam operation of the Swiss railways 1847-1966, p. 407