History of a locomotive - SP SD7
Posted: Tue Apr 10, 2018 3:21 pm
EMD SD7 Build #15990 - The SD7 Demo/SP 5308/SP1518
History:
Southern Pacific Railroad's (SP) number 1518 is an EMD SD7 diesel locomotive. It was built originally in May 1951 as General Motors
Electro-Motive Division's (EMD) Demonstrator 990.
It was the first "SD" series locomotive ever built. Its road number 990 is in reference to its EMD Engineering Department Project Number: 15990.
It demonstrated on several roads before being sold to Southern Pacific on 10/10/52 and sent back to EMD for refurbishing and repainting
in SP's tiger stripe paint and renumbering as #5308.
It was classified in one-unit class DF-116 as it was slightly different from all the other SD7s owned by Southern Pacific.
It entered service at Ogden, UT on 10/23/52 and was immediately sent to work on SP subsidiary Northwestern Pacific Railroad alongside SP's other SD7s.
As delivered, it had dual control stands, a winterization hatch over the forward fan and two single A-200 "blat" horns mounted on the roof of the long hood directly behind the cab.
SP added a steam generator inside the short hood and a large "beer barrel" or "trash can" Mars signal light above the headlight on the front of the short hood.
In the mid-1950s SP repainted it in the "black widow" paint scheme, then into the scarlet and grey scheme about 1959.
Since it still had dual control stands, the painted feathers were applied to both ends. It was the only SD7 to have feathers at both ends denoting two control stands for bi-directional operation.
In the early 1970s it was repainted without the rear feather, although it retained its dual control stands.
SP renumbered the locomotive to #2715 in 1965, then to #1415 in 1/74 when the EMD MP15AC deliveries approached the 27xx numbers.
Sometime during the late Sixites, the two A-200 horns were replaced by a Nathan P3 on the right side and a Nathan M5 on the left side.
Also at some point during the late Sixties, the large Mars signal light was replaced with an end mounted Pyle National sealed-beam Gyralight.
The locomotive was rebuilt at the Sacramento General Shops as an SD7R in 1980 and renumbered to #1518, and was released for service on 2/5/80.
In this rebuild, it lost its dual control stands, dual horns, cab end water tank, and winterization hatch.
It was the only SD7 to have a winterization hatch, a feature that was very rare on SP but not unknown - several SP F7 and the odd GP20 also had them.
Union Pacific Railroad took control of the SP in late 1996, and 1518 was retired on 5/5/97 and sent to the UP's roundhouse in Cheyenne, Wyoming, to be preserved.
Instead, Southern Pacific 1518 was donated in April 2003 to the Illinois Railway Museum where it currently resides in operable condition.
All of the liveries the locomotive wore are represented in this collection, as well as the hardware configurations. Some of the numbers aren't.
We've tried to make the models as accurate as possible, but we've left a few mistakes to keep the rivet counters happy. ;-)
The creators: Michael Stephen, Dan Vystrcil, Mike Durdan, and Micheal Calvin
