LVD series Bt
| LVD series Bt / Pt | |
|---|---|
| Numbering: | LVD Bt 55-63, Pt 96-99 |
| Number: | 13 |
| Manufacturer: | Henschel |
| Year of construction (s): | 1936-1938 |
| Retirement: | after 1945 |
| Axis formula : | 1'B1 'h2t |
| Gauge : | 1,435 / 1,524 mm |
| Service mass: | 68.0 t |
| Friction mass: | 34.8 t |
| Wheel set mass : | 17 t |
| Top speed: | 105 km / h |
| Driving wheel diameter: | 1,400 mm (Pt), 1,720 mm (Bt) |
| Impeller diameter: | 850 mm |
| Control type : | Heusinger |
| Number of cylinders: | 2 |
| Cylinder diameter: | 430 mm |
| Piston stroke: | 630 mm |
| Boiler overpressure: | 15 bar |
| Grate area: | 1.9 m² |
| Superheater area : | 35.0 m² |
| Evaporation heating surface: | 98.0 m² |
| Water supply: | 8.0 m³ |
| Fuel supply: | 2.5 t |
| Brake: | Westinghouse air brake handbrake |
| Particularities: | Locomotives can be re-tracked and designed for changing drive wheel diameters |
The LVD series Bt and Pt were tank locomotives of the Latvian State Railroad Latvijas Valsts Dzelzsceļi (LVD) with the wheel arrangement 1'B1 '. The locomotives were developed and built by Henschel from Kassel between 1936 and 1938 based on the LVD series Ct , which was delivered at the same time . For the locomotives, a comparatively simple conversion of the track width and drive wheel size was taken into account.
history
The Bt and Pt series are among the few new traction vehicle acquisitions by LVD in the period between the beginning of Latvian independence in 1918 and the Soviet occupation of Latvia in 1940. Due to the construction history of its railway lines and especially the effects of the First World War, the LVD owned lines in a total of five gauges . Apart from the extensive narrow-gauge network in 600, 750 and 1,000 mm gauge, most of the network was designed in Russian broad gauge of 1,524 mm. In addition, there were also lines in European standard gauge of 1,435 mm, especially from Liepāja , Daugavpils and Riga in the direction of Lithuania , over which the connection to Central and Western Europe ran.
In order to flexibly meet the different requirements due to the different gauges, the LVD demanded for the Bt / Pt and Ct / Rt series, which were commissioned in 1934 and 1936, that the components of the locomotives should be largely interchangeable. But above all the locomotives should be designed so that they from the outset for the Umspurung were mm suited to wheel sets of both gauges, 1435 and 1524. In addition, it should be possible to switch between two different drive wheel diameters with little effort, 1,400 and 1,720 mm in diameter. The series designations of the LVD have been changed according to the drive wheel size. Class Bt locomotives had large and Pt class locomotives had small drive wheels. The track width, on the other hand, could not be taken from the designations, the lowercase letter t only meant that the locomotives could be switched between normal and broad gauge.
Henschel had taken over the further deliveries of the Ct / Rt series on behalf of LVD. On the one hand, the company adapted its design to the client's wishes, and on the other hand, it developed the Bt / Pt series as a lighter variant, taking into account largely uniform components. As with the Ct / Rt locomotives, the drive wheel size was changed by repositioning and screwing the steering frame drawbars and return spring guides, the brake hanger bearings as well as the buffers and draw hooks.
The Henschelloks were delivered in three lots from 1936 to 1938. In 1936 the first three locomotives came as the Bt series with the Henschel serial numbers 23089 to 23091, directly following the first Henschel series of the Ct series. In 1938 10 locomotives followed in two lots, also as the Bt series. The first lot consisted of four locomotives with the serial numbers 23866 to 23869, the second six locomotives with the subsequent serial numbers 23870 to 23875. However, the LVD arranged these two lots in the opposite order.
It is unclear how far this constructively possible flexibility has proven itself. Based on the numbering recorded on delivery and at the time the LVD was taken over by the Soviet state railways in 1940, it can be seen that at least the drive wheels of the locomotives with numbers 96 to 99 of the Bt / Pt series were changed accordingly, for the Ct / Rt a change is not used. In addition, there is no information available about the operational performance. It is not known with which gauge the locomotives were delivered. In 1940 the LVD had the following numbers:
- Bt
- 1,435 mm: 3 locomotives
- 1,524 mm: 6 locomotives
- Pt
- 1,435 mm: -
- 1,524 mm: 4 locomotives
In contrast to the Ct series, probably no locomotives made their way into the area of the Deutsche Reichsbahn . There is no precise information about the post-war use of the locomotives that remained in the Baltic States.
Individual evidence
- ↑ Hesselink, Tempel, p. 80
literature
- Herman Gijsbert Hesselink, Norbert Tempel: Railways in the Baltic States , Lok-Report publishing house, Münster 1996, ISBN 3-921980-51-8 .