| About
the Train
Passenger Cars | Southern
Pacific 786 | Alco Diesel 442 | Rail
Line History
 |
| 786 takes a final spin on the Houston turntable
before being donated to the City of Austin in 1956. >>Enlarge |
Related link: Where's
the Steam Engine?
The 786 was completed by the American Locomotive
Company's Brooks Works of Dunkirk, New York in August of 1916.
The locomotive was one of the group of 20 Southern Pacific Mk-5
class 2-8-2 Mikados (numbers 775 to 794). 786 was placed in service
on the Houston & Texas Central subsidiary of the SP in September
of 1916.
The locomotive received several upgrades throughout
its career, including:
1. original extended smokebox shortened in the 1920's
2. boiler pressure upgraded from 200 to 210 psi at Houston in 1930
3. installation of a feedwater heater and superheaters at Houston in 1941
786 was retired from service and donated to the
City of Austin in March of 1956. It was placed on display near
the firehouse on Trinity between 4th and 5th streets. It would
remain there for 34 years. In 1989 the 786 was leased to the newly-formed
Austin Steam Train Association and was removed from display the
following year. Restoration of the locomotive began in June of
1990 at the Westinghouse Motor Co. shops in Georgetown, Texas.
A team of both professional and volunteer crews completed the intense
restoration in a relatively brief amount of time. For three days
in December 1991 the operational 786 and one coach car were at
the center of a celebratory festival in downtown Austin. The first
passenger excursion pulled by the restored 786 arrived in Burnet
on July 25, 1992.
After seven years of reliable service, 786
was temporarily sidelined in July 1999 following the discovery
of cracks in a key component of the locomotive. The cracks, which
had apparently started decades ago and worked their way to the
surface, will require replacement of the cylinder saddle casting
-- a task which has not been undertaken in the United States
in more than 50 years. Learn more on the "Where's
the Steam Engine?" page.
SP 786 technical specifications, present
day
Engine
Wheel arrangement: 2-8-2, Mikado
Drivers: 63 inches diameter (the tire at the rails)
Cylinders: 26 inch bore, 28 inch stroke
Loaded weight of engine: 285,980 lbs. (143 tons)
Loaded weight on drivers: 213,380 lbs. (107 tons)
Operating steam pressure: 200 psi
Computed tractive effort: 53,360 lbs.
Overall length: 80 ft. 2 1/16 inches (engine and tender combined)
Overall height: 15 ft. 10 3/8 inches (over the stack)
Width over cylinders: 10 ft. 8 3/8 inches
Wheel base:
Drivers 16 ft. 6 in.
Engine 35 ft. 2 in.
Engine and tender 73 ft. 7 7/8 in.
Wheel diameters:
Pilot 30 in.
Drivers 63 in.
Trailing 45 in.
Feedwater heater: Worthington 'S' or 'SA' type
Whistle: Nathan 6-chime, brass
Boiler design: Straight top, sloping backhead
Heating surfaces:
Tubes 3,974 sq. ft.
Superheater 865 sq. ft.
Firebox 235 sq. ft.
Firebox: 120 5/8 in. x 84 in.
Boiler tubes: 275 each of 2 in. tubes plus 36 each of 5 3/8 in. tubes
Valve gear: Walschaert's with power reverse
Tender
Design: Vanderbilt type (horizontal cylindrical water tank)
Water capacity: 9,000 gallons
Oil capacity: 2,940 gallons
Length: 33 ft. 91/2 in.
Overall width: 10 ft. 2 1/2 in.
Empty weight: 57,600 lbs.
Loaded weight: 156,100 lbs. |