EMD SDP35
Encyclopedia
An EMD SDP35 is a 6-axle diesel locomotive
built by General Motors Electro-Motive Division between July 1964 and September 1965. Power was provided by an EMD 567D3A 16-cylinder
engine which generated 2500 horsepower
(1.9 MW). Essentially this locomotive was an EMD SD35
equipped with a steam generator, located in the extended long hood end, for passenger use. 35 examples of this locomotive model were built for American
railroads.
The SD35
and SDP35 were so similar that EMD published a single operator's manual to cover both.
With its older E-units reaching the end of their serviceable lives, Seaboard Air Line 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.
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 (10, numbered 1400-1409).
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, 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 MKT E8s. At the SCL merger, it was assigned number 600 and then later received SCL number 1950.
In 1966, when the EMD 645
prime mover superseded the EMD 567
, the SDP35 was replaced in EMD's catalog by the EMD SDP40
.
1114, is displayed by the depot in Hamlet
, North Carolina. It is owned by the National Railroad Museum and Hall of Fame.
Locomotive
A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco – "from a place", ablative of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine, first used in the early 19th...
built by General Motors Electro-Motive Division between July 1964 and September 1965. Power was provided by an EMD 567D3A 16-cylinder
Cylinder (engine)
A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work...
engine which generated 2500 horsepower
Horsepower
Horsepower is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the...
(1.9 MW). Essentially this locomotive was an EMD SD35
EMD SD35
An EMD SD35 is a 6-axle diesel 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. This locomotive model shared a common frame with the EMD SD28,...
equipped with a steam generator, located in the extended long hood end, for passenger use. 35 examples of this locomotive model were built for American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
railroads.
The SD35
EMD SD35
An EMD SD35 is a 6-axle diesel 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. This locomotive model shared a common frame with the EMD SD28,...
and SDP35 were so similar that EMD published a single operator's manual to cover both.
With its older E-units reaching the end of their serviceable lives, Seaboard Air Line 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.
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 (10, numbered 1400-1409).
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, 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 MKT E8s. At the SCL merger, it was assigned number 600 and then later received SCL number 1950.
In 1966, when the EMD 645
EMD 645
The EMD 645 family of diesel engines was designed and manufactured by the Electro-Motive Division of General Motors. Intended primarily for locomotive, marine and stationary engine use, one 16-cylinder version powered the 33-19 "Titan" prototype haul truck designed by GM's Terex...
prime mover superseded the EMD 567
EMD 567
The EMD 567 is a line of diesel engines built by General Motors' Electro-Motive Division. This engine, which succeeded Winton's 201-A, was used in EMD's locomotives from 1938 until its replacement in 1966 by the EMD 645. It has a bore of , a stroke of and a displacement of 567 in³ per cylinder...
, the SDP35 was replaced in EMD's catalog by the EMD SDP40
EMD SDP40
An EMD SDP40 is a 6-axle passenger diesel locomotive built by General Motors Electro-Motive Division between June 1966 and May 1970. Although few were produced, they enjoyed long service lives.-Design:...
.
Original owners
| Railroad | Quantity | Road numbers | Notes |
|---|---|---|---|
| Seaboard Air Line Railroad Seaboard Air Line Railroad The Seaboard Air Line Railroad , which styled itself "The Route of Courteous Service," was an American railroad whose corporate existence extended from April 14, 1900, until July 1, 1967, when it merged with the Atlantic Coast Line Railroad, its longtime rival, to form the Seaboard Coast Line... |
|
1100–1119 | to Seaboard Coast Line Railroad Seaboard Coast Line Railroad The Seaboard Coast Line Railroad was a former Class I railroad company operating in the Southeastern United States beginning in 1967. Its passenger operations were taken over by Amtrak in 1971... 601-620, 1951-1970. |
| Atlantic Coast Line Railroad Atlantic Coast Line Railroad The Atlantic Coast Line Railroad was an American railroad that existed between 1900 and 1967, when it merged with the Seaboard Air Line Railroad, its long-time rival, to form the Seaboard Coast Line Railroad... |
|
550 | renumbered 1099,to Seaboard Coast Line Railroad Seaboard Coast Line Railroad The Seaboard Coast Line Railroad was a former Class I railroad company operating in the Southeastern United States beginning in 1967. Its passenger operations were taken over by Amtrak in 1971... 600,1950,Later L&N 7035. |
| Louisville and Nashville Railroad Louisville and Nashville Railroad The Louisville and Nashville Railroad was a Class I railroad that operated freight and passenger services in the southeast United States.Chartered by the state of Kentucky in 1850, the L&N, as it was generally known, grew into one of the great success stories of American business... |
|
1700–1703 | renumbered 1221-1224 |
| Union Pacific Railroad Union Pacific Railroad The Union Pacific Railroad , headquartered in Omaha, Nebraska, is the largest railroad network in the United States. James R. Young is president, CEO and Chairman.... |
|
1400–1409 | |
| Total | 35 | ||
Preservation
Seaboard Air Line RailroadSeaboard Air Line Railroad
The Seaboard Air Line Railroad , which styled itself "The Route of Courteous Service," was an American railroad whose corporate existence extended from April 14, 1900, until July 1, 1967, when it merged with the Atlantic Coast Line Railroad, its longtime rival, to form the Seaboard Coast Line...
1114, is displayed by the depot in Hamlet
Hamlet, North Carolina
Hamlet is a town in Richmond County, North Carolina, United States. The population was 6,018 at the 2000 census.-Geography:Hamlet is located at ....
, North Carolina. It is owned by the National Railroad Museum and Hall of Fame.