GN class Y1
| Great Northern Railway Y-1, Great Northern Railway Y-1a, Pennsylvania Railroad FF2 |
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| Numbering: | 5010–5017 (GN), 1–7 (PRR) |
| Number: | 8th |
| Manufacturer: | American Locomotive Company , General Electric |
| Year of construction (s): | 1927-1930 |
| Axis formula : | (1'Co) (Co1 ') |
| Gauge : | Standard gauge (1,435 mm) |
| Length over coupling: | 22,479 mm (73 ft 9 in ) |
| Height: | 3,962 mm (13 ft) to the top of the roof |
| Width: | 3,185 mm (10 ft 5 3/8 in) |
| Bogie axle base: | 2,337 mm (7 ft 8 in) |
| Service mass: | 240 t (527,600 lb ) |
| Friction mass: | 187 t (411,600 lb) |
| Top speed: | 88 km / h (55 mph ) |
| Continuous output : | 2,237 kW (3,000 hp ) |
| Starting tractive effort: | 457 kN (102,900 lb f ) |
| Driving wheel diameter: | 1,397 mm (55 in) |
| Impeller diameter: | 914 mm (36 in) |
| Power system : | 11 kV , 25 Hz , single phase alternating current |
| Power transmission: | Overhead line |
| Number of traction motors: | 6 each with 410 kW (550 PS) |
| Translation levels: | 1: 3.9 |
| Brake: | Compressed air |
The class Y-1 of the Great Northern Railway comprised eight electric locomotives built by the American Locomotive Company and General Electric with the axle formula (1Co) '(Co1)' . With the Pennsylvania Railroad this series was later referred to as class FF2 .
history
Between 1925 and 1929 the Great Northern built a new 12.5 kilometer long Cascade Tunnel under the Stevens Pass . The entire electrified section between Wenatchee and Skykomish in Washington state was 117 km long. In this tunnel, too, the use of steam locomotives was impossible due to the inadequate ventilation .
In contrast to the 6.6 kV three-phase alternating current with 25 Hertz previously used in the old tunnel, 11 kV single-phase alternating current with 25 Hertz was now used. This took over the experience from the successful tests with the same system on the Detroit, Toledo and Ironton Railroad . New locomotives also had to be purchased for use on the new tunnel route.
The locomotives were built for the Great Northern Railway (GN) between 1927 and 1930. The first two locomotives were delivered in 1927, the next two in 1928 and four in 1930. At that time, the machines were the largest converter locomotives in the world.
The GN vehicles had the numbers 5010 to 5017. The locomotive with the number 5011 was rebuilt after an accident in 1945, with streamlined cabs of the type used in the EMD FT series instead of the previous box-shaped structure . This locomotive was henceforth designated as class Y-1a .
After the end of electrical operation at GN, the PRR acquired all eight locomotives in 1956. The converted Y1-a only served the PRR as a spare parts dispenser and was never used. The seven other locomotives were given the numbers 1 through 7 and were used on the electrified routes in eastern Pennsylvania.
Between 1960 and 1966, all locomotives were gradually decommissioned and scrapped.
Constructive features
It was converters - locomotives , where the alternating current from the overhead line initially stepped down was and two AC motors drive. The transformer was cooled with a fan and had an output voltage of 2300 volts. Turn the AC motors drove two 750-V DC generators at which the DC - traction motors supplied. Six GE-290-A traction motors each drove one axle of the locomotive.
The locomotives also had multiple controls and a regenerative brake.
literature
- Alvin Staufer: Pennsy Power . Staufer, 1962, p. 246-253 .
- Norman C. Keyes, Jr. and Kenneth R. Middleton: The Great Northern Railway Company: All-Time Locomotive Roster, 1861-1970 . In: The Railway and Locomotive Historical Society, Inc. (Ed.): Railroad history . tape 143 , no. 117 , ISSN 0090-7847 .
- William D. Middleton : When the steam railroads electrified . 2nd revised edition. Indiana University Press, Bloomington, IN 2001, ISBN 978-0-253-33979-9 (American English).
