Pennsylvania Railroad's Odd D #10003 was an experimental

electric locomotive An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a battery or a supercapacitor. Locomotives with on-board fuelled prime movers, such as diesel engines or g ...

built in 1907 by Baldwin and Westinghouse. It had a 4-4-0

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

in the

Whyte notation Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel arrangement. It was devised by Frederick Methvan Whyte, and came into use in the early twentieth cen ...

, 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.

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LIRR Early Electric Engines (TrainsAreFun.com)
4-4-0 locomotives D (Odd) #10003 11 kV AC locomotives Experimental locomotives Individual locomotives of the United States Electric locomotives of the United States Railway locomotives introduced in 1907 Scrapped locomotives Unique locomotives Standard gauge locomotives of the United States {{US-rail-transport-stub