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Southern Pacific 2472
Southern Pacific 2472 is a 4-6-2 Pacific-type steam locomotive built by the Baldwin Locomotive Works for Southern Pacific Railroad (SP) in 1921. SP 2472 is one of three surviving Southern Pacific 4-6-2 Pacific locomotives. The 4-6-2 designation means it has 4 leading wheels, 6 driving wheels, and 2 trailing wheels.

SP 2472 and the other Pacific locomotives served the Overland Route from Ogden, Utah, to Oakland, California. On November 30, 1929, SP's Ogden shops added a feedwater heater to the locomotive, which increased its overall weight to 300,000 lb (140,000 kg). SP 2472 again underwent a rebuild at SP's Bayshore shops in Brisbane, California (San Mateo County), completed on November 26, 1940, which increased its boiler pressure to 210 psi (1,400 kPa) and its tractive effort to 45,850 pounds-force (204.0 kN).

After being replaced by the 4-8-2 "Mountain" type locomotives, 2472 and all other Pacific locomotives were sent to work Sacramento-Oakland passenger trains and San Francisco-San Jose commute trains, along with occasional freight service. The locomotive's revenue service life ended in 1957 when steam-powered traction was being replaced by diesel locomotives, and on April 10, 1959, 2472 was donated to San Mateo County, which put the unit on static display at the San Mateo County Fairgrounds. It remained there until 1976 when a group of volunteers decided to restore the locomotive.

In the 1990s and early 2000s, 2472 pulled several excursions and Caltrain specials such as the "Toys for Tots", and double-headed on an excursion in 1992 (during the NRHS Convention) with famed steam locomotive Southern Pacific 4449.

SP 2472 received Federal Railroad Administration-mandated boiler work at Hunters Point Naval Base in San Francisco, during 2005–06 when the Golden Gate Railroad Museum (GGRM) was located there. The GGRM and all other tenants at Hunter's Point had to leave the former navy base in 2006 due to redevelopment. The initial equipment move took place in February 2006, although an extended lease on the shop building allowed work to continue on 2472 for ten more months. On December 31, 2006, SP 2472 and the remaining pieces of GGRM rolling stock completed relocation to the Niles Canyon Railway located in Sunol, California, on the east side of San Francisco Bay.

The locomotive became serviceable in February 2008, and is stored in Niles Canyon at the Brightside Yard between operations. SP 2472 operates in Niles Canyon, usually on Memorial Day weekends and Labor Day weekends, and on other dates as announced.

SP 2472 Overview
Type and origin
Power type: Steam
Builder: Baldwin Locomotive Works
Serial number: 54477
Build date: January 1921
Specifications
Configuration:
​ • Whyte 4-6-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 73 in (1,854 mm)
Adhesive weight: 181,000 lb (82,000 kg)
Loco weight: 300,000 lb (140,000 kg)
Fuel type: Fuel oil
Boiler pressure: 210 psi (1.4 MPa)
Cylinder size: 25 in × 30 in (635 mm × 762 mm)
Performance figures
Tractive effort: 46,800 lbf (208.18 kN)
Factor of adhesion: 4.15
Career
Operator: Southern Pacific
Class: P-8
Number in class: 15
Road Number: 2472
Delivered: April 15, 1921
Retired: February 7, 1957
Restored: May 1991
Current owner: Golden Gate Railroad Museum
Disposition: Operational at the Niles Canyon Railway

See also:

4-6-2 Pacific Locomotive

Southern Pacific

Steam Locomotives

Niles Canyon Railway

Golden Gate Railway Museum Official Website: http://www.ggrm.org/

Niles Canyon Rwy logo
Southern Pacific P-8 Class 4-6-2 No. 2472 at Sunol, California prior to an excursion on Memorial Day, 2009.

Southern Pacific P-8 Class 4-6-2 No. 2472 at Sunol, California prior to an excursion on Memorial Day, 2009.

By Espeeac12 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=7714335

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