Interestingly, a three-rail system was quite prototypical and state-of-the-art at the time. Many real railroads were switching to electric locomotives, utilizing a third rail for power, particularly in the densely populated East. Most Lionel locomotives sold before about 1930 were modeled after prototype electrics.

Lionel trains utilize a three-rail system primarily for electrical simplicity and reliability. In this setup, the center rail carries the "hot" (positive) electric current, while the two outer rails act as the "common" (ground) return. This symmetrical design solved a major problem for early toy trains: it allows for complex track geometries, like "reverse loops," without creating a short circuit. On a standard two-rail train, the left and right rails must be insulated from each other; if the track loops back on itself, the positive rail would meet the negative rail, causing a spark. With three rails, the center remains constant regardless of the train's orientation. Additionally, the three-rail design provided better electrical contact in the early 20th century when tracks were often dusty or uneven, ensuring the heavy AC-powered motors received a steady flow of energy even if one outer rail was momentarily blocked by debris.