PRR Odd D 10003

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PRR Odd D 10003
PRR Odd D 10003 2.jpg
Odd D #10003
Type and origin
Power type Electric
Build date 1907
Total produced 1
Configuration 4-4-0
AAR wheel arr. 2-B
UIC classification 2'B
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Electric system(s) 11 kV, AC, 25 Hz
Current collection
Internal diagram

Pennsylvania Railroad's Odd D #10003 was an experimental electric locomotive built in 1907 of 4-4-0 wheel arrangement in the Whyte notation, or 2-B in the AAR scheme. On the PRR, class D was assigned to 4-4-0 locomotives. Production classes of locomotive were assigned a number after the letter, but one-off locomotives were simply designated "Odd".

In testing, #10003 proved to be more stable at speed than the two class AA1 B-B locomotives the PRR had also constructed, so its 4-4-0 arrangement and high center of gravity was chosen as the design for the PRR's DD1 production locomotives.


  • Staufer, Alvin (1962). Pennsy Power. Staufer. p. 247. LOC 62-20878. 

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