The EP-5 was introduced in 1956, and was a credible copy of the General Electric EP-5 rectifier, which ran on the New Haven Railroad. Lionel erroneously called this engine "Little Joe." This Lionel engine came with a single motor and four instead of six-wheel trucks that the prototype had, but otherwise it was enhanced with Lionel’s best features.

The New Haven No. 2350 was in production for three years (1956-58) and during this period Lionel had problems in painting the complex colored pattern on the front of these engines. This resulted in a major variation where they painted the side "N" orange and the "H" black. Also, stresses placed upon the body through handling caused cracks at the ends where the body was attached to the chassis. These problems were partially illeviated when Lionel made a front adhesive decal that at least would cover up the damage. This decal has been applied to many of these units over the years and engines with pristine painted ends are hard to find. Beware of reproduction or repaints of the rare variation that will have the letters silk screened on. All of the original shells will show evidence of heat-stamped letters which is what Lionel used on all of these engines.

There are no numbers in the number boards, however, Lionel painted their production number on the side of each of these units. All of the engines that Lionel made of these are highly sought after by collectors today. See the Numerical Index for additional details about the individual engines in this class.

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