DB class 42.90
| DB class 42.90 | |
|---|---|
H0 model of the 42 9000 without smoke deflectors, in gray photo paint
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| Numbering: | 42 9000-9001 |
| Number: | 2 |
| Retirement: | 1960 |
| Type : | 1'E h2 |
| Gauge : | 1435 mm ( standard gauge ) |
| Smallest bef. Radius: | 140 m |
| Empty mass: | 87.6 t |
| Service mass: | 98.7 t |
| Service mass with tender: | 157.4 t (with full stocks) |
| Friction mass: | 87.1 t |
| Wheel set mass : | Ø 17.4 t (max. 18.5 t on the 1st coupling axle) |
| Top speed: | 80 km / h |
| Indexed performance : | 1,199 kW / 1630 PSi |
| Starting tractive effort: | ~ 214 kN |
| Driving wheel diameter: | 1,400 mm |
| Impeller diameter front: | 850 mm |
| Number of cylinders: | 2 |
| Cylinder diameter: | 600 mm |
| Piston stroke: | 660 mm |
| Boiler overpressure: | 16 bar |
| Number of heating pipes: | 42 |
| Number of smoke tubes: | 28 |
| Heating pipe length: | 5200 mm |
| Grate area: | 3.90 m² |
| Radiant heating surface: | 15.9 m² |
| Tubular heating surface: | 105.32 m² |
| Superheater area : | 63.50 m² |
| Evaporation heating surface: | 250.18 m² (including 128.96 m² heating surface of the exhaust gas preheater (206 heating pipes)) |
| Tender: | 2'2 'T 30 |
| Water supply: | 30.0 m³ |
| Fuel supply: | 10 tons of coal |
| Train heating: | steam |
The class 42.90 of the Deutsche Bundesbahn were steam locomotives for the freight train service , which were converted as a Franco-Crosti locomotive on a trial basis .
history
In 1951 the Henschel company equipped the locomotives 52 893 and 52 894 with Franco-Crosti preheating boilers. Because of the increased axle load , the vehicles were added to the 42.90 series and given the road numbers 42 9000 and 42 9001.
After completion, the locomotives were tested by the Railway Testing Office in Minden until 1952 . A fuel saving of around 15% compared to the original series 52 was determined. The experience gained flowed into the Franco-Crosti boiler of the DB class 50.40 .
From 1952 to 1958 she was the Bw Bingerbrück used. They were then based in the Oberlahnstein depot until they were decommissioned in 1960 at the latest. The short operating time of a maximum of nine years of service was mainly due to the fact that the additionally installed preheating boiler suffered from considerable corrosion, which made maintenance and servicing too expensive.
Technical features
For preheating, two preheating kettles were installed on the right and left under the long tank of the machines. The flue gases were diverted down into the preheating boiler in the smoke chamber . Two additional chimneys conducted the flue gases together with the exhaust steam from the cylinders outside. They were attached to the side of the long boiler at the level of the third coupling axle . The existing chimney on the front of the smoke chamber was retained. It was only used for heating purposes when the vehicle was at a standstill. During the journey it was shut down and locked with a flap. As a special feature, the 42.90 had three chimneys per locomotive . The two side chimneys earned the 42.90 the nickname Easter Bunny in railway circles .
Initially, the two locomotives were driven without smoke deflectors . However, smoke gases penetrated the driver's cab from the side chimneys , which in the long term was unsustainable for the moving personnel. As recently as 1951, the locomotives received large smoke deflectors and wind deflectors on the cab roof. The side chimneys were later given additional smoke deflectors. The more technology the two vehicles corresponded to the series 52. They were with a Tender the type 2'2 'T 30 equipped.
Web links
- English website with pictures of the DB class 42.90
- 42 9001 1957 at the Joachim Schmidt Railway Foundation
literature
- Jürgen-Ulrich Ebel / Rüdiger Gänsfuß: Franco-Crosti The 42.90 and 50.40 series . EK-Verlag, Freiburg 2002, ISBN 978-3-88255-150-1 .