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Baldwin Demonstrator No. 6001.

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Baldwin Demonstrator No. 6001.
Missouri Pacific Railroad (MP) Baldwin DR-4-4-15 Babyface units at Jefferson City, Missouri in 1953.
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Elgin, Joliet and Eastern No. 701A and 701B.

Elgin, Joliet and Eastern No. 701A and 701B.

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Pennsylvania Railroad DR-4-4-15 Sharknose units at Cincinnati, Ohio.
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Missouri Pacific Railroad (MP) Baldwin DR-4-4-15 "Babyface" units at Jefferson City, Missouri in 1953. MP and NYC units were constructed three feet longer than the earlier CNJ units, though the wheelbase of all units was the same. Some references state these units had steam generators. These units fell out of favor on the MP due to incompatibility with EMD  and Alco diesel units. 

"Mopac-Babyfaces" by http://photoswest.org/cgi-bin/imager?00013045+OP-13045. Licensed under Fair use via Wikipedia - https://en.wikipedia.org/wiki/File:Mopac-Babyfaces.jpg#/media/File:Mopac-Babyfaces.jpg

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Pennsylvania Railroad DR-4-4-15 "Sharknose" units at Cincinnati, Ohio. Note the prominent side fuel fill, a signature feature.

 "PRR DR-4-4-15 Sharknose" by http://digital.denverlibrary.org/cdm/ref/collection/p15330coll22/id/64055. Licensed under Fair use via Wikipedia - https://en.wikipedia.org/wiki/File:PRR_DR-4-4-15_Sharknose.jpg#/media/File:PRR_DR-4-4-15_Sharknose.jpg

Baldwin DR-4-4-15
The Baldwin DR-4-4-15 was a 1,500-horsepower cab unit-type diesel locomotive built for freight service by the Baldwin Locomotive Works between November 1947 and June 1950. It was produced in two different body types, nicknamed the "Babyface" and "Sharknose" styles by railfans, though Baldwin used the same model number for both. 22 "Babyface" cab-equipped A units were built, along with 11 cabless booster B units; 36 "Sharknose" A units and 36 B units were constructed, making a total for all models of 105 locomotives built.

Original buyers
"Babyface" units produced (1947–1948)

Central Railroad of New Jersey
Quantity A units: 10
Quantity B units: 5
Road numbers A units: 70–79
Road numbers B units: K, L, M, R, S
Missouri Pacific Railroad
Quantity A units: 8
Quantity B units: 4
Road numbers A units: 201–208
Road numbers B units: 201B–204B
New York Central Railroad
Quantity A units: 4
Quantity B units: 2 Road numbers A units: 3400–3403
Road numbers B units: 3700–3701
Notes: Renumbered 3800–3803 (A)
Total "Babyface" A units: 22, Total "Babyface" B units: 11

"Sharknose" units produced (1949–1950)
Baldwin Locomotive Works (demonstrators)

Quantity A units: 2
Quantity B units: 2
Road numbers A units: 6001A, 6001A1
Road numbers B units: 6001B, 6001B1
Notes: to Elgin, Joliet and Eastern Railroad No. 700A/No. 701A (A) No. 700B/No. 701B (B), then to Baltimore and Ohio Railroad 847, 849 (A) 847X, 849X (B), later 4200–4201 (A), 5200–5201 (B)
Pennsylvania Railroad
Quantity A units: 34
Quantity B units: 34
Road numbers A units: 9568A–9593A, 9700A–9707A
Road numbers B units: 9568B–9593B, 9700B–9707B
Notes: 9700A, B–9707A, B were equipped with Baldwin RF-16 bodies, and are therefore referred to by some as "RF-15s."
Total "Sharknose" A units: 36, Total "Sharknose" B units: 36

Baldwin DR-4-4-15 Overview

Type and origin
Power type: Diesel-electric
Builder: Baldwin Locomotive Works
Model: DR-4-4-15
Build date: November 1947 – June 1950
Total produced: 105
Specifications
Gauge: 4 ft 8 1⁄2 in standard gauge
Prime mover: 608SC
Engine type: Four-stroke diesel
Performance figures
Power output: 1,500 hp
Career
Nicknames: Babyface / Sharknose
Locale: North America
Disposition: All scrapped

See also:

Baldwin RF-16

Baldwin Locomotive Works

Baldwin Diesels

Diesel-Electric Locomotives