diesel-electric locomotive
A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving whee ...
EMD 567D3A
The EMD 567 is a line of large medium-speed diesel engines built by General Motors' Electro-Motive Division. This engine, which succeeded Winton's 201A, was used in EMD's locomotives from 1938 until its replacement in 1966 by the EMD 645. It h ...
EMD SD35
An EMD SD35 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between June 1964 and January 1966. Power was provided by an EMD 567D3A, 16- cylinder engine which generated . A fuel tank was used on this unit ...
equipped with a steam generator, located in the extended long hood end, for
passenger
A passenger (also abbreviated as pax) is a person who travels in a vehicle, but does not bear any responsibility for the tasks required for that vehicle to arrive at its destination or otherwise operate the vehicle, and is not a steward. The ...
use. 35 examples of this locomotive model were built for American railroads.
History
With its older E-units reaching the end of their serviceable lives,
Seaboard Air Line
The Seaboard Air Line Railroad , which styled itself "The Route of Courteous Service," was an American railroad which existed from April 14, 1900, until July 1, 1967, when it merged with the Atlantic Coast Line Railroad, its longtime rival, t ...
asked EMD for a passenger version of the SD35 that could double as a freight unit, especially if passenger trains continued to be discontinued. EMD came up with the SDP35, and SAL placed an order, trading in E4 and E6 units. The first of SAL's new SDP35s was delivered in summer 1964. Eventually the SDP35 wound up going to four railroads: SAL (20, numbered 1100–1119), Atlantic Coast Line (1, numbered 550), Louisville and Nashville (4, numbered 1700–1703) and
Union Pacific
The Union Pacific Railroad , legally Union Pacific Railroad Company and often called simply Union Pacific, is a freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Pac ...
(10, numbered 1400–1409).
The SD35 and SDP35 were so similar that EMD published a single operator's manual to cover both.
Although SAL successfully used the SDP35 in high-speed passenger service as well as on expedited freight and piggyback trains, Union Pacific found it unsuitable and relegated its entire fleet to freight service while its famous yellow E-units continued to handle passengers. With the July 1, 1967 Seaboard Coast Line merger, SAL units received passenger numbers 601-620 and also served SCL in both high-speed freight service and on passenger trains. With the arrival of
Amtrak
The National Railroad Passenger Corporation, doing business as Amtrak () , is the national passenger railroad company of the United States. It operates inter-city rail service in 46 of the 48 contiguous U.S. States and nine cities in Canada ...
, SCL renumbered them into the freight series and numbers 1951–1970. Later in their SCL years, they were renumbered again and assigned into the heavy yard duty and assigned 4500-series numbers. ACL's lone unit was renumbered 1099 when the line acquired former MKTE8s. At the SCL merger, it was assigned number 600 and then later received SCL number 1950.
Louisville & Nashville's four SDP35s (1700–1703), ordered in spring 1964 to replace aging E and F units in passenger service, were completed and delivered without steam generation equipment installed, after approval of several passenger train cancellations from government regulatory agencies during the locomotives' assembly, leaving L&N with a surplus of passenger locomotives. After delivery L&N assigned the SDP35s to general freight service, installing radio control locomotive equipment in the steam generator compartment and using the engines in locotrol service until 1969.
In 1966, when the EMD 645
prime mover
Prime mover may refer to:
Philosophy
*Unmoved mover, a concept in Aristotle's writings
Engineering
* Prime mover (engine), motor, a machine that converts various other forms of energy (chemical, electrical, fluid pressure/flow, etc) into energy ...
superseded the
EMD 567
The EMD 567 is a line of large medium-speed diesel engines built by General Motors' Electro-Motive Division. This engine, which succeeded Winton's 201A, was used in EMD's locomotives from 1938 until its replacement in 1966 by the EMD 645. It h ...
, the SDP35 was replaced in EMD's catalog by the EMD SDP40.
Original owners
Preservation
*
Seaboard Air Line Railroad
The Seaboard Air Line Railroad , which styled itself "The Route of Courteous Service," was an American railroad which existed from April 14, 1900, until July 1, 1967, when it merged with the Atlantic Coast Line Railroad, its longtime rival, t ...
1114 is displayed by the depot in
Hamlet
''The Tragedy of Hamlet, Prince of Denmark'', often shortened to ''Hamlet'' (), is a tragedy written by William Shakespeare sometime between 1599 and 1601. It is Shakespeare's longest play, with 29,551 words. Set in Denmark, the play depi ...