Facts and Figures
 
Builder :	ALCO (American Locomotive Company)
Model	:	S6
Builders Number:	81301
Date Delivered:	June, 1955
Original Number:	1051 (1955 to 1965) (SP class DS9)
Final Number:	1218 (System Renumbering in 1965, changed to SP class AS409-1)
Engine Model:	251B
Horsepower:	900 @ 1000rpm (turbosupercharged)
Weight	:	232,780 pounds
Length 	:	45' 6"
Height	:	15' 10"
Width	:	10' 3"
Fuel Capacity:	635 Gallons

The
locomotive was bought
new by the Southern Pacific in 1955 and  was part of an order for
19 identical units.  Out of a total of 93 locomotives constructed
by ALCO for
domestic use, the Southern Pacific owned 70 which were purchased in
1955 and 1956 in 5 different groups.  They lasted on the
SP system until the summer of 1980 and never received heavy
modifications.

These are
pages from a
1957 Southern Pacific Diesel Unit Diagram Book.   It is
interesting to note that the book shows the locomotive equipped with a
speedometer but there is no sign of there ever having been one
installed.