ČSD series M 251.0
| ČSD series M 251.0 | |
|---|---|
| Numbering: | M 251.001-002 |
| Number: | 2 |
| Manufacturer: | Tatra Mountains Kopřivnice |
| Year of construction (s): | 1929 |
| Retirement: | 1941 renovation |
| Axis formula : | (1A) (A1) |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 21,000 mm |
| Height: | 4,280 mm |
| Trunnion Distance: | 13,200 mm |
| Bogie axle base: | 3,100 mm |
| Total wheelbase: | 16,240 mm |
| Empty mass: | 39.1 t |
| Service mass: | 45.6 t |
| Top speed: | 80 km / h |
| Installed capacity: | 2 × 100 hp |
| Driving wheel diameter: | 1,000 mm |
| Wheel diameter: | 940 mm |
| Motor type: | Tatra Mountains |
| Motor type: | 6-cylinder four-stroke petrol engine |
| Rated speed: | 1200 rpm |
| Power transmission: | mechanical transmission type Winterthur |
| Seats: | 68 |
| Classes : | 3. |
The M 251.0 series were four-axle, twin-engine benzene - mechanical multiple units for mixed traffic of the former Czechoslovak State Railways (ČSD). They were among the first types of twin-engine railcars with mechanical power transmission.
History and commitment
In 1929 Tatra Kopřivnice delivered two more motor vehicles with twin engines to the ČSD. They were designated as the M 251.0 series and were similar in structure to the M 220.3 series . So they had the mechanical transmission of the Winterthur type and the drive unit from Tatra. Only the gear ratio has been changed.
Both cars continued to run after 1938 because they were stationed in the Košice area. In 1939 they were passed on to the Magyar Államvasutak (MAV). Since 1941, through the continued use of the vehicles, they have become known as the Szekely multiple unit train .
Six different types of twin-engine motor coaches from Tatra were built over a period of three years, with a small number of a maximum of three vehicles. The engine output was relatively low compared to a single-engine vehicle of the series ( M 220.1 ), which resulted in no operational advantages. Except for the M 251.0 and M 251.1, the speed was no higher than that of the local rail cars .
When powerful engines became available around 1938, it would be possible to use this type of vehicle to procure lighter vehicles than the ČSD series M 274.0 with the same output (see M 260.0 ). However, no further railcars were procured.
technical features
The vehicles were powered by two six-cylinder four-stroke gasoline engines from Tatra. The engines were the same as in the M 220.3 series. The mechanical transmission of the Winterthur type was used for the mechanical power transmission. This transmission was four-speed and had only one input and one output shaft.
In the case of the transmission, only the transmission ratio on the drive axle has been changed compared to the M 220.3 series.
The car body, on the other hand, was taken over from the M 221.2 with minor changes . The difference was that it had a luggage compartment and fewer compartments for the passengers. The seat division was 2 + 2.
See also
literature
- Jindrich Bek, Josef Janata, Jaroslav Veverka: Malý atlas lokomotiv 2. Elektrická a motorová trakce. Nadas Publishing House, Prague 1969
Web links
Individual evidence
- ^ Mihály Kubinszky: Hungarian locomotives and railcars , publisher: Akadémiai Kiadó, Budapest 1975, ISBN 963-05-0125-2 , page 245