SNB Eb 3/4

NOB Eb 3/4
Numbering:	SNB 4, 6, 8, 10-18
Number:	12
Manufacturer:	SLM
Year of construction (s):	1875-1877
Retirement:	1896-1901
Axis formula :	1'C
Length over buffers:	10,590 mm
Empty mass:	33.5 t
Service mass:	43.5 t
Friction mass:	34.0 t
Top speed:	75 km / h
Driving wheel diameter:	1,600 mm
Control type :	Walschaert
Number of cylinders:	2
Cylinder diameter:	420 mm
Piston stroke:	600 mm
Boiler overpressure:	10 bar
Number of heating pipes:	144
Heating pipe length:	3,712 mm
Grate area:	1.60 m²
Evaporation heating surface:	93.70 m²
Water supply:	5.0 m³
Fuel supply:	1.5 t
Locomotive brake:	Spindle brake

The Eb 3/4 of the Swiss National Railway ( SNB ) is a tender steam locomotive that was procured in 1875. The locomotive was purchased from the Swiss Locomotive and Machine Factory in Winterthur for a purchase price of 59,000 Swiss francs.

It differs from the SNB Ed 3/4 only in the different drive wheel diameters (1600 mm instead of 1300 mm) and the different number of boiler tubes in the otherwise identical boiler, most of the components were interchangeable among these machines. They were finally taken over by the Swiss Northeast Railway (NOB) in 1880 after the bankruptcy of the railway administration in 1878 .

General

The Moguls tender machine is the first in Switzerland to be delivered from the factory with this wheel alignment. The procurement was preceded by a technical dispute between SLM and the railway department about the supposedly endangered operational safety. For example, radially displaceable axle sleeves had to be installed on the running axle. However, the result of the construction showed that the fears of the railway department were unfounded. Because the locomotive runs very smoothly, also because it had no overhanging cylinders.

Technical

The tank locomotive, built for passenger train service, has a pulling force of 3300 kg at 45 km / h and an output of 550 hp. The boiler had a steam dome on which the Ramsbottons safety valve was located. The slide regulators were located in the branch pipe in front of the steam dome , on which the inlet pipes led down outside were located. The two cylinders were directly below, and thus behind the smoke chamber. Between the deeply drawn down inner frame was a large 5 m³ water tank, the filling opening of which was in front of the smoke chamber. The coal supply of 1.5 tons was carried in a box behind the driver's cab. The suspension springs of the barrel axle and the first coupling axle were mounted above the frame and connected by tie rods and angle levers. The suspension of the second coupling axle, which was also the driving axle, and the third coupling axle were suspended under the bearings. The external engine was equipped with a Walschert type of control, which was switched using a screw and wheel. The four-block spindle brake acted on the two rear axles. The sandpit was designed as a square box and was located around the steam dome. Steam heating was installed. They were the first NOB locomotives to receive a continuous brake. This was first the Klose spring brake with vapor brake, invented by Adolf Klose in 1883. In the years 1885/86, these were fitted with Wegner's automatic compressed air braking device on six machines. At the same time, the other six machines received a non-automatic Schleifer air brake, which was replaced by the Wegner brake in 1889. The main air reservoirs were mounted in a tubular shape on the circulation plates.

SNB until 1880	NOB 1880-1895	NOB 1895-1902	Factory number	Construction year	Manufacturer	Discarded
4th	261	151	77	1875	SLM	1896
6th	262	152	79	1875	SLM	1897
8th	263	153	81	1875	SLM	1896
10	264	154	107	1876	SLM	1898
11	265	155	108	1876	SLM	1898
12	266	156	109	1876	SLM	1899
13	267	157	110	1876	SLM	1899
14th	268	158	114	1877	SLM	1899
15th	269	159	115	1877	SLM	1900
16	270	160	116	1877	SLM	1900
17th	271	161	117	1877	SLM	1901
18th	272	162	118	1877	SLM	1899

swell

The steam operation of the Swiss railways 1847-1966 (Moser book) p. 106ff