Bavarian E I

The Bavarian Class E I steam locomotives operated by the Royal Bavarian State Railways encompassed four different variants of saturated steam, goods train locomotive with a 2-8-0 wheel arrangement.

Standard variant, older type

Bavarian E I Standard variant, older type
Number(s)	Bavaria: 2051–2062 France: Etat 140-901 to 903
Quantity	12
Manufacturer	Krauss
Year(s) of manufacture	1894–1896
Retired	1924
Wheel arrangement	2-8-0
Axle arrangement	1'D n2
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	16800 mm
Wheelbase incl. tender	12750 mm
Service weight	64.4 t
Adhesive weight	54,0 t
Axle load	13.5 t (centre)
Top speed	50 km/h
Driving wheel diameter	1170 mm
Leading wheel diameter	1006 mm
Valve gear	Walschaerts (Heusinger), outside
No. of cylinders	2
Cylinder bore	540 mm
Piston stroke	560 mm
Boiler Overpressure	12 kg/cm^2 = 11.77 bar
Grate area	2.43 m^2
Evaporative heating area	159.8 m^2
Tender	bay 3 T 12.3
Tender service weight	32.8 t
Water capacity	12.3 m^3
Fuel	5.5 t coal

The first series of E I's was built by Krauss in 12 examples. The cylinders were positioned in front of the carrying axle and drove the first coupled axle. The carrying and driving axles were linked together in a Krauss-Helmholtz bogie. In addition the outside Walschaerts (Heusinger) valve gear had very short connecting rods on the engines delivered to Bavaria.

The vehicles were coupled with Bavarian Class bay 2'2' T 18 tenders. Later they were equipped with Class 3 T 12.3 tenders from the Bavarian B XI's.

Sondermann Variant

Bavarian E I Sondermann variant
Number(s)	Bavaria: 2063–2064
Quantity	2
Manufacturer	Krauss
Year(s) of manufacture	1896–1897
Retired	1924
Wheel arrangement	2-8-0
Axle arrangement	1'D n4v
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
No. of cylinders	4
Cylinder bore	2x370/710 mm
Piston stroke	560 mm
Boiler Overpressure	13.5 kg/cm^2 = 13.24 bar
Tender	bay 3 T 12.3
Tender service weight	32.8 t
Water capacity	12.3 m^3
Fuel	5.5 t coal
certain technical data as for the newer standard variant; slightly differing weights

The second E I series delivered to the Royal Bavarian State Railways was the Sondermann Variant built from 1896. It had two overlapping cylinders that formed a combined double slide valve (Doppelschieber). The carrying axle and the first driving axle were housed in a Krauss-Helmholtz bogie. The advantage of this locomotive variant was that the double cylinder was very short as a result of the tandem construction. Nevertheless, the engine did not perform especially well, so that the two units were converted into locomotives with a conventional cylinder arrangement.

Standard variant, newer type

Bavarian E I Standard variant, newer type
Number(s)	Bavaria: 2065–2099, 2116–2130 France: Etat 140-904 to 905, 907 Belgium: Etat Belge 7374–7375 Poland: PKP Tr101-1
Quantity	48
Manufacturer	Krauss
Year(s) of manufacture	1899–1901
Retired	1923–1925
Wheel arrangement	2-8-0
Axle arrangement	1'D n2
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	18202 mm^1
Wheelbase incl. tender	15425 mm^1
Service weight	64.5 t
Adhesive weight	54.5 t
Axle load	13.6 t (centre)
Top speed	60 km/h
Driving wheel diameter	1170 mm
Leading wheel diameter	1006 mm
Valve gear	Walschaerts (Heusinger), outside
No. of cylinders	2
Cylinder bore	540 mm
Piston stroke	560 mm
Boiler Overpressure	12 kg/cm^2 = 11.77 bar
Grate area	2.43 m^2
Evaporative heating area	159.8 m^2
Tender	bay 3 T 13.8 bay 3 T 14 bay 2'2' T 18
Tender service weight	34.9 / 36.3 / 43.0 t
Water capacity	13.8 / 14.0 / 18.0 m^3
Fuel	5.5 / 6.0 / 6.5 t coal
^1 with bay 2'2' T 18 tender

The third series of the E I locomotive was the final version of this particular class. A total of 48 vehicles were made and 42 were taken over by the Reichsbahn with the numbers 56 312 - 56 353. It was the same as the Sondermann variant after the conversion of the latter. These locomotives could haul a train of 820 tons at a speed of 50 km/h and even attained a speed of 40 km/h with a 1,390 ton train. On a line with a 0.5% incline they could manage an 845-ton train at 25 km/h.

Vauclain Variant

Bavarian E I (Vauclain)
Number(s)	Bavaria: 2085–2086 France: Etat 140-906
Quantity	2
Manufacturer	Baldwin
Year(s) of manufacture	1899
Retired	1917-1919
Wheel arrangement	2-8-0
Axle arrangement	1'D n4v
Length over buffers	18,501 mm
Service weight	62.6 t
Adhesive weight	54.4 t
Axle load	13.6 t (centre)
Top speed	50 km/h
Driving wheel diameter	1,270 mm
Leading wheel diameter	914 mm
Valve gear	Stephenson, inside
Cylinder bore	2 x 356/610 mm
Piston stroke	660 mm
Boiler Overpressure	14 kg/cm^2 = 13,73 bar
Grate area	3.08 m^2
Evaporative heating area	177.50 m^2
Tender	bay 2'2' T 18.1
Tender service weight	44.0 t
Water capacity	18.1 m^3
Fuel	6.5 t coal

The Class E I locomotives built for the Royal Bavarian State Railways by the Baldwin were goods train steam locomotives imported from the United States for testing purposes.

The two machines were the first in Germany to have a bar frame, which had been standard in the USA virtually from the beginning and which had been developed from the wooden beam frames of the early locomotives.

Like the two S 2/5 express train locomotives also imported from Baldwin a year later these engines were equipped with a four-cylinder Vauclain compound engine, on which the high-pressure and low-pressure cylinders were located directly one above the other and worked on the same connecting rods. Apart from the bar frame, this type of drive did not catch on in Bavaria.

The locomotives were equipped with Bavarian 2'2' T 18,1 tenders.

See also

• Royal Bavarian State Railways
• List of Bavarian locomotives and railbuses

Sources

• Merkbuch für die Fahrzeuge der Reichsbahn. I. Dampflokomotiven und Tender (Regelspur). Ausgabe 1924. Berlin: Eisenbahn-Zentralamt Berlin. 1924.
• Scheingraber, Günther (1975). Die Königlich Bayerischen Staatseisenbahnen. Stuttgart: Franckh. ISBN 3-440-04233-2.
• v. Welser, Ludwig (1996). Bayern-Report Band No. 6. Fürstenfeldbruck: Merker. ISBN 3-922404-94-4.