The Alco S-5 (DL 421A) was a
diesel-electric switcher locomotive
A switcher locomotive (American English), shunter locomotive (British English), station pilot (British English), or shifter locomotive (Pennsylvania Railroad terminology) is a locomotive used for maneuvering railway vehicles over short distanc ...
rated at , that rode on two-axle
trucks
A truck or lorry is a motor vehicle designed to transport freight, carry specialized payloads, or perform other utilitarian work. Trucks vary greatly in size, power, and configuration, but the vast majority feature body-on-frame construction ...
, having a
B-B wheel arrangement.
This was Alco's second attempt to build a replacement
251
__NOTOC__
Year 251 (Roman numerals, CCLI) was a common year starting on Wednesday of the Julian calendar. At the time, in the Roman Empire, it was known as the Year of the Consulship of Traianus and Etruscus (or, less frequently, year 1004 ''A ...
-engined switcher to replace the
539
Year 539 ( DXXXIX) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Strategius without colleague (or, less frequently, year 1292 ''Ab urbe condita''). The denomination 5 ...
-engined
S-3 and
S-4. Only seven were sold. The demonstrator unit was ALCO specification DL421 and the six production units were ALCO specification DL421A. Alco fitted the 251A engine in its replacement, the
S-6 with power output raised by .
Original owners
See also
*
List of ALCO diesel locomotives
The American Locomotive Company (ALCO), based in Schenectady, New York, United States produced a wide range of Diesel-electric transmission, diesel-electric locomotives from its opening in 1901 until it ceased manufacture in 1969. This is a list o ...
*
List of MLW diesel locomotives
Following is a list of diesel locomotives built by the Montreal Locomotive Works, a Canada, Canadian subsidiary of the American Locomotive Company from 1904-1964. From 1964-1975 the company was known as MLW-Worthington and was owned by Bombardier ...
External links
* Sarberenyi, Robert.
Alco S5, S6, and SSB9 Original Owners'.
B-B locomotives
S5
Diesel–electric locomotives of the United States
Railway locomotives introduced in 1954
Standard-gauge locomotives of the United States
Shunting locomotives
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