VR Class Hr1
Hr1 1021 with Witte-type smoke deflectors
Type and origin
Power typeSteam
BuilderLokomo Oy and Tampella Oy
Build date1937–1957
Total produced22
Specifications
Configuration:
​
 • AAR4-6-2
Gauge1,524 mm (5 ft)
Driver dia.1,900 mm (6 ft 3 in)
Length22.2 m (72 ft 10 in)
Loco weight155 tonnes (153 long tons; 171 short tons) with tender
Boiler pressure15 bar (1,500 kPa; 220 psi)
CylindersTwo, outside
Valve gearWalschaerts
Performance figures
Maximum speed110 km/h (68 mph)
Tractive effort114 kN (25,630 lbf)
Career
OperatorsVR
First run1937
Withdrawn1972 returned to service due to oil crisis withdrawn in 1974
Dispositionsix scrapped, remainder preserved

The Hr1 class (original classification P1) was the largest passenger express steam locomotive built in Finland. Twenty-two were built between the years 1937–1957. They were numbered 1000–1021.

In the 1930s, there was a need for faster and heavier express trains in Finland, and the Hv1–Hv3 classes were not powerful enough to fill the need. Lokomo Oy in Tampere built first two prototypes, and after successful trials 20 more were built. Most of the locomotives were fitted with Wagner-type smoke deflectors, but the last two, which were equipped with roller bearings, had Witte-type deflectors.

The class's nickname was "Ukko-Pekka", meaning approximately "(respected) Grandpa Pekka", after the President of Finland Pehr Evind Svinhufvud.

The Hr1 was built for coal firing, but during the coal shortage after the war in 1945, birch wood was used as fuel. Larger chimneys needed for extinguishing wood sparks were temporarily fitted.

The Hr1s were the most important express steam locomotive and could justifiably be called the "flagships" of VR until 1963, when diesel locomotives started to replace steam. Their use ended officially in 1971, but two Hr1s equipped with roller bearings were brought back to use for a short time in the spring of 1974. One engine, 1005, was a participant in the worst peacetime railroad accident in Finland, the Kuurila accident, in 1957. The engine is preserved at Haapamäki.

Hr1's sister locomotive was the Tr1 class, otherwise similar, but with 2-8-2 wheel arrangement and smaller diameter drivers for freight train use.

Preservation

The following are preserved:

See also

References

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.