PROTOTYPE
Class J-2 USRA Heavy 4-8-2S built in 1918 at Alco, . Brooks, U.S.A.
Weight: 776 tons
Gauge of track: 4' 8-1/2"
Fuel : Soft coal
Steam pressure: 200 Ibs/in2 |
| SCALE |
1"=1 ' (1/12 full scale) |
| GAUGE |
4-3/4" (121 mm) or 5" (127 mm) |
| DRIVINIG WHEELS |
Diameter 142 mm (5-19/32") steel tired. |
| CYLINDERS |
BORE 55 mm (2-5/32")
STROKE 70 mm (2-3/4")
DRAIN 4 cocks (hand) |
| PISTON VALVES |
BORE 27 mm (1-1/16")
TRAVEL 16 mm (5/8")
FULL GEAR CUT-OFF 80%
STEAM LAP 3 mm (1/8")
EXHAUST LAP 0.5 mm (1/64")
PORT OPENING 4.5 mm (11/64") |
| VALVE GEARS |
Baker's type BOILER |
BOILER
Extended wagon top with combustion chamber
Material: All copper, silver soldered throughout
Twin pop type safety valves
Hydraulic test pressure: 14 Kg/cm2 (200 lbs/in2)
Working pressure' (MAX): 6.3 Kg/cm2 (90 lbs/in2)
Water capacity: Approx.10lit. (2.64 U.S. gal.)
Grate area: 200mm x 240 mm (7-7/8" x 9-1/2")
Fuel: Coal or Liquefied petroleum gas
Regulator: Screw type
Superheater: Outer dia. 6mm stainless steel tubes 10 pcs. |
WATER SUPPLY SYSTEM
Axle driven double acting pumps (2)
O10 mm x 20 mm stroke (D.3/8" x 25/32" stroke)
Double acting hand pump:
O19 mm x 26 mm stroke (D.3/4" x 1" stroke )
Injector: Dry range 3-5 kg/cm2 (43-71 lbs/in2 )
Capacity 700 cc/min. (24.5 oz./min.)
Water pump: Westinghouse air compressor type
O10 mm x 20 mm stroke (O3/8" x 3/4" stroke)
Capacity 800cc/min. (28 oz./min.)
Feed water heater: Copper tubes 11 pcs.
O.D. 6 mm x 330 mm (O.D. 15/64" x 13") |
LUBRICATORS
For cylinders: Mechanical twin ram type
O3 mm x 6.6 mm stroke (O1/8" x 1/4" stroke)
Ratchet 34 teeth feeding
Recommended oil : Steam oil
Oil tank capacity: 95cc (3.3 oz.)
For axle boxes (8) and feed eccentrics (2):
Water pump type
One way clutch
O3 mm x 6.4 mm (O1/8" x 1/4" stroke)
Recommended oil : Machine oil
Oil tank capacity: 100 cc (3.5 oz.) |
| STEAM WHISTLE |
3 note chime |
| BRAKES |
2 steam brake cylinders Dia. 20 mm (Dia. 3/4") Hand
brake equipped on tender |
| STEAM TURBOGENERATOR |
Output 3V x 0.1A |
| WEIGHT (DRY ) |
Engine 100kg (220 Ibs.)
Tender (included driver's seat) 42 Kg ( 93 Ibs.)
Tender water capacity Appros. 22 Iit. (5.8 U.S. gal.) |
| SIZE |
Length 2,227 mm (87-11/16")
Width 270 mm (10-5/8")
Height 400 mm (15-3/4")
Wheel bases Engine 1,005 mm (39/1/2")
Tender 652 mm (25-21/32")
Engine & Tender 1,987 mm (78-7/32") |
