my ESPEE MODELERS ARCHIVE
California's Railroad to the U.S. 1861 - 1996
Southern Pacific's PA diesel locos, came in three main flavors, SP/SSW/T&NO, and variations abound within these three groups .
Southern Pacific received their first PA1/PB1's in 1948, delivered in 3 unit sets numbered 6005 ABC to 6007 ABC. These were equipped with retractable front couplers, which didn't last long, and ATS (Automatic Train Stop)
Another 9 were delivered in 1949, 6008 ABC thru 6010 ABC. These came with the 'standard' ALCo pilot and ATS.
After 1949 the letter suffixes were dropped, and the PA's renumbered 6005 thru 6016. The PB's were renumbered 5910 thru 5915.
In 1950 four PA2's (6019 - 6022) and 2 PB2's (5918, 5919) were delivered, Basically the same appearance as the PA1/PB1's, they came with larger (4500 lb/hr) steam generators and ATS.
1952 saw another 5 PA2's (6023 - 6027) and 2 PB2's (5920, 5921), these and subsequent orders of PA's came without pilots, and SP fitted plow pilots built by Sacramento General Shops. These were also the first PA's to have factory fitted nose MU sockets.
6 more PA2's came in 1953 (6028 - 6033) and 3 PB3's (5922 - 5924). These PA's were the first without the curved drip strip over the cab side windows, and no rear porthole, but did have 5 chime horns instead of three chime horns.
The final additions were 12 PA2's delivered late 1953 (6034 - 6045), identical to the previous PA2's, and like all other SP PA's they also had ATS.
The PA2/PB2's had 250 hp more than the 2000 hp PA1/PB1's, but this was only available at higher speeds than SP ran their trains. So as they were in effect, rated the same as the PA1/PB1's, SP called them all PA1/PB1's.
Starting in 1956, all PA/PB's were rebuilt/upgraded. Work may have included:
builders photo of SP PB #6005b from George Paine
All SP PA/PB's were delivered in Daylight paint, beginning in 1959 they were repainted to the scarlet and grey scheme. Before that though;
There is a persistent rumor that one or two PA's were painted in the Black Widow scheme. However no proof has surfaced that this was in fact true.
see also: SSW PA/PB's
see also: TNO PA's
Additional S Scale info courtesy James Baglien.
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This document prepared and maintained by Richard.A.Percy.
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This document © 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008. Richard.A.Percy