ČSD series 476.0
| ČSD series 476.0 | |
|---|---|
 |
|
| Numbering: | ČSD 476.001–003 |
| Number: | 3 |
| Manufacturer: | Škoda , Plzeň serial numbers 1905 to 1907 |
| Year of construction (s): | 1949-1950 |
| Retirement: | circa 1970 |
| Axis formula : | 2'D1 'h3v |
| Gauge : | 1435 mm ( standard gauge ) |
| Length: | 15,100 mm |
| Height: | 4425 mm |
| Total wheelbase: | 12,150 mm |
| Service mass: | 107.7 t |
| Friction mass: | 65.8 t |
| Wheel set mass : | 16.5 t |
| Top speed: | 100 km / h |
| Driving wheel diameter: | 1625 mm |
| Impeller diameter front: | 880 mm |
| Rear wheel diameter: | 1150 mm |
| Number of cylinders: | 3 |
| HD cylinder diameter: | 500 |
| LP cylinder diameter: | 580 |
| Piston stroke: | 660 mm |
| Boiler overpressure: | 20 bar |
| Grate area: | 4.34 m² |
| Superheater area : | 63.4 m² |
| Evaporation heating surface: | 201 m² |
| Tender: | 932.3 |
| Service weight of the tender: | 68.5 t |
| Water supply: | 32 m³ |
| Fuel supply: | 13.3 m³ |
| Brake: | Westinghouse |
| Control: | Heusinger |
| Particularities: | adjustable axle load |
The locomotives of the CSD series 476.0 were for universal service designed Tender locomotives of the former Czechoslovak State Railways (CSD), which in Plzeň from Škoda were produced and their engine as a special feature as a three-cylinder steam composite machine was running.
history
The ČSD series 476.0 was created between 1949 and 1950 with roughly the same parameters as the ČSD series 475.1, which appeared two years earlier . Obviously, the locomotives with three-cylinder compound engines were intended as a type of comparison to the two-cylinder engines.
The manufacturer used parts from the 475.1 series for them , for example the boiler with a fire box and combustion chamber . They were also fitted with a mechanical grate loading system and advanced elements such as axle roller bearings, central lubrication and a Kylchap double blow pipe . The locomotives were completely welded.
technical description
The steam engine consisted of the middle high pressure and the outer low pressure cylinders. They had pressure equalizing piston valves with a two-stage steam inlet. All three cylinders acted on the second coupling axis, which was designed as a bolster axis . An outer pawl of the Heusinger control transmitted the movements of the rocker inward to the slide of the high-pressure cylinder. The control was operated by pneumatic cylinders on the circulation. The cylinder for the high pressure engine was on the right, that for the low pressure engine on the left. Both were operated by the engine driver through a control valve. A start-up device made it possible to operate the engine as a triple engine and thus fill all three cylinders with live steam.
The boiler pressure was 20 bar. The machines were equipped with a superheated steam regulator, so that the superheater was usually constantly under boiler pressure. Two steam jet pumps were used to feed the boiler .
Like the series 498.0 , the locomotives had the option of changing the axle pressure of the coupled wheel sets. Until the conversion, the locomotives 476.001 and 002 ran with a coupled axle drive mass of 16.5 and the 476.003 with one of 18 tons.
Together with the tenders of the 932.3 series, the machines were painted red-brown.
commitment
Initially, the three locomotives were used in express train service on the Přerov - Praha - Košice - Přerov route. The locomotives showed the same performance as the 498.0 series . After a while, difficulties arose, in particular due to damage to the drive rods, coupling rods and drive pins. The cause was to be found in an excess of power in the low-pressure engine, known from similar problems with the 334.4 and 344.2 series . The locomotives tended to skid, and when a certain engine speed was exceeded, the governor locked. The difficulties could not be resolved, so the locomotives were turned off.
reconstruction
Originally, it was planned to purchase 15 more machines from this series. After the operational difficulties became known, this order was canceled and an additional 12 locomotives of the 475.1 series were ordered.
At the status after the test, the locomotives could no longer be used. However, they were powerful locomotives that were urgently needed in operational service. It was therefore decided to convert the three existing locomotives. The reconstruction took place in the Přerov locomotive depot until 1964 . After that, the machines were returned to operations.
They were converted into two-cylinder machines with single-stage steam expansion; the boiler pressure was lowered to 17 bar. The regulator was veneered, as was the inner cylinder. The internal engine was removed.
The axle pressure was set uniformly to 18 t for all locomotives. It is interesting that these demanding modifications were carried out by engineers from the Přerov locomotive depot , led by engineer Falc.
After this conversion, the locomotives performed well. Compared to the 475.1 series , they had a slightly higher steam consumption, but the starting tractive effort was higher. They were popular with the locomotive staff.
The 476.001 locomotive was retired in 1971 and continued to be used as the K 491 heating locomotive
Locomotive 476.002 derailed on February 27, 1968 in Nedakonice at a speed of 88 km / h and was then taken out of service
The 476.003 was retired in 1971
See also
literature
- Bek Jindřich, Janata Josef, Veverka Jaroslav: Malý atlas lokomotiv 1. Parní lokomotivy, Nadas Publishing House, Prague 1970
Web links
- Factory photo of the 476.001 on k-report.net
