Pilatus Railway

The Pilatus Railway

The Pilatus railway (German: Pilatusbahn, PB) is a mountain railway in Switzerland and is the steepest rack railway in the world, with a maximum gradient of 48% and an average gradient of 35%. The line runs from Alpnachstad, on Lake Lucerne, to a terminus near the Esel summit of Mount Pilatus at an altitude of 2,073 m (6,801 ft), which makes it the highest railway in Obwalden and the second highest in Central Switzerland after the Furka line. At Alpnachstad, the Pilatus railway connects with steamers on Lake Lucerne and with trains on the Brünigbahn line of Zentralbahn.

The Pilatus Railway History

The first project to build the line was proposed in 1873, suggesting a 1,435 mm (4 ft 8 1⁄2 in) and 25% maximal gradient. However it was concluded that the project would not be economically viable.

Then Eduard Locher, an engineer with great practical experience, proposed an alternative project with the maximal grade raised to 48% to cut the route in half. Conventional systems at the time could not handle such gradients because the vertical cogwheel that is pressed to the rack from above may, under higher gradients, jump out of the engagement with the rack, eliminating the train's main driving and braking power. Instead, Locher placed a horizontal double rack between the two rails with the rack teeth facing each side. This was engaged by two cogwheels carried on vertical shafts under the car.

This design eliminated the possibility of the cogwheels climbing out of the rack, and additionally prevented the car from toppling over, even under the severe cross winds common in the area. The system was also capable of guiding the car without the need for flanges on the wheels. Indeed, the first cars on Pilatus had no flanges on running wheels but they were later added to allow cars to be moved through tracks without rack rails during maintenance. The line was opened using steam traction on 4 June 1889 and was electrified on 15 May 1937, using an overhead electric supply of 1550 V DC.

The government provided no subsidy for the construction of the line. Instead, Locher established his own company "Locher Systems" to build the railway. The railway was built entirely with private capital and has remained financially viable throughout its life.

The Pilatus railway was named a Historic Mechanical Engineering Landmark by the American Society of Mechanical Engineers in 2001.

The Pilatus Railway Operation

The line is 4.6 km (2.86 mi) long, climbs a vertical distance of 1,629 m (5,344 ft), and is of 800 mm (2 ft 7 1⁄2 in) gauge. Because of the rack-system, there are no conventional points or switches on the line, only rotary switches (see photograph) and traversers. All railway is laid on solid rock, securing rails by high-strength iron ties attached to the rock, without using any ballast.

The line still uses original rack rails that are now over 100 years old. While they have worn down, it was discovered that this can be fixed by simply turning the rails over, providing a new wearing surface that would be sufficient for the next century as well. The car electric engines are used as generators to brake the car during descent, but this electricity is not reused – it is just dissipated as heat through resistance grids. Originally, the steam engines were used as compressors to provide dynamic braking, since the use of friction brakes alone is not practical on such steep slopes.

The Pilatus Railway Overview

The Pilatus Railway Status:                     Operational
The Pilatus Railway Locale:                     Obwalden, Switzerland
The Pilatus Railway Stations:                   Alpnachstad – Pilatus Kulm
The Pilatus Railway Opened:                    4 June 1889 (Steam), reopened 15 May 1937

The Pilatus Railway Technical Operation

The Pilatus Railway Line Length:              4.6 km (2.86 mi)
The Pilatus Railway Track Gauge:            800 mm (2 ft 7 1⁄2 in)
The Pilatus Railway Electrification            1550 V, DC
                                                                  overhead line
The Pilatus Railway Operating Speed:     9 km/h downhill, about 10 km/h uphill.

The Pilatus Railway Elevation and Incline

The Pilatus Railway Highest Elevation:    2,073 m (6,801 ft)
The Pilatus Railway Maximum Incline:     48 %
The Pilatus Railway Rack System:           Locher

The Pilatus Railway Route Diagram

0,0 Alpnachstad 440m AMSL

1,3 Wolfort 890m AMSL

Wolforttunnel (40m)

Tunnel Spycher I (47m)

Tunnel Spycher II (97m)

2,3 ÄmsigenPassing loop 1355m AMSL

3,3 Mattalp 1600m AMSL

Tunnel Eselwand I (44m)

Tunnel Eselwand II (50m)

Tunnel Eselwand III (46m)

Tunnel Eselwand IV (9m)

4,8 Pilatus Kulm 2073m AMSL

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