Post by pcarrell on Feb 27, 2007 13:26:40 GMT -5
1926 4-12-2
The Union Pacific Class 9000
Engine weight: 224.5 tons
Coupled wheelbase:
Total wheelbase:
Boiler pressure: 220 psi
No of Cylinders: 3
Inside cylinder: 27" x 31"
Outside cylinders: 27" x 32"
Driver diameter: 5' 7"
Power output: 4750 HP
Tractive effort: 96,650 lbs
Builder: Alco
NB: There is some doubt about the cylinder dimensions.
These were the heaviest rigid steam locomotives produced in the USA; 88 were built for the UP by ALCO between 1926 and 1930. The original intended speed had been a modest 35 mph, but they proved stable up to 60 mph. After only ten years of main-line freight service in Oregon, Wyoming and Utah, these locomotives were relegated to slower operations in Nebraska, being displaced by Challengers and Big Boys.
THE UP Turbine Project
These machines were the only condensing steam locomotives built and operated in the USA and were in many ways engineering triumphs but eventually proved practical failures, like almost all the turbine experiments in both the USA and Britain. The locomotives were complete electric power-stations on wheels, and correspondingly complex. A large air-cooled condenser recycled most of the water and provided (in theory, at least) a vacuum that improved turbine efficiency.
Two were built by General Electric and rolled out in December 1938.
Delivered to UP in April 1939
Returned to GE in June 1939, following unsatisfactory results
Saw extensive use on the GNR in a motive power shortage in 1943
Returned to GE and retired late 1943.
Steam conditions 1500 lb/sqin, 920 degF
Boiler Water-tube with forced circulation
Fuel Bunker C fuel oil
Turbine Two-stage cross-compound, 12,500 rpm
Generators Two DC 12-pole variable-voltage, 1200rpm
Traction motors Six, air-cooled
General arrangement of the UP steam turbine locomotive.
1-6 Traction motors
7-8 Main generators
9 Alternators
10 Exciter
11 Battery charger
12 Braking resistances
13 Control contactors
14 Storage battery
15 Traction motor blower
16 Boiler
18 HP turbine
19 LP turbine
20 Exhaust header
21 Air-cooled condensers
23 Condensate tank
26 Feed water pump
27 Feed water heater
28 Boiler auxiliaries turbine
29 Condenser fan turbine
30 Air compressor
31 Train heating evaporator
33 Raw water tank
34 Boiler draught fan
36 Boiler control panel
37 Traction motor blowers
38 Fuel oil tanks
From www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/locoloco.htm
The Union Pacific Class 9000
Engine weight: 224.5 tons
Coupled wheelbase:
Total wheelbase:
Boiler pressure: 220 psi
No of Cylinders: 3
Inside cylinder: 27" x 31"
Outside cylinders: 27" x 32"
Driver diameter: 5' 7"
Power output: 4750 HP
Tractive effort: 96,650 lbs
Builder: Alco
NB: There is some doubt about the cylinder dimensions.
These were the heaviest rigid steam locomotives produced in the USA; 88 were built for the UP by ALCO between 1926 and 1930. The original intended speed had been a modest 35 mph, but they proved stable up to 60 mph. After only ten years of main-line freight service in Oregon, Wyoming and Utah, these locomotives were relegated to slower operations in Nebraska, being displaced by Challengers and Big Boys.
THE UP Turbine Project
These machines were the only condensing steam locomotives built and operated in the USA and were in many ways engineering triumphs but eventually proved practical failures, like almost all the turbine experiments in both the USA and Britain. The locomotives were complete electric power-stations on wheels, and correspondingly complex. A large air-cooled condenser recycled most of the water and provided (in theory, at least) a vacuum that improved turbine efficiency.
Two were built by General Electric and rolled out in December 1938.
Delivered to UP in April 1939
Returned to GE in June 1939, following unsatisfactory results
Saw extensive use on the GNR in a motive power shortage in 1943
Returned to GE and retired late 1943.
Steam conditions 1500 lb/sqin, 920 degF
Boiler Water-tube with forced circulation
Fuel Bunker C fuel oil
Turbine Two-stage cross-compound, 12,500 rpm
Generators Two DC 12-pole variable-voltage, 1200rpm
Traction motors Six, air-cooled
General arrangement of the UP steam turbine locomotive.
1-6 Traction motors
7-8 Main generators
9 Alternators
10 Exciter
11 Battery charger
12 Braking resistances
13 Control contactors
14 Storage battery
15 Traction motor blower
16 Boiler
18 HP turbine
19 LP turbine
20 Exhaust header
21 Air-cooled condensers
23 Condensate tank
26 Feed water pump
27 Feed water heater
28 Boiler auxiliaries turbine
29 Condenser fan turbine
30 Air compressor
31 Train heating evaporator
33 Raw water tank
34 Boiler draught fan
36 Boiler control panel
37 Traction motor blowers
38 Fuel oil tanks
From www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/locoloco.htm