Electro-Motive Division (EMD), General Motors Corporation provided some sketches of proposed color schemes in anticipation of the dieslization on the Monon. All designs were based on the black, red and gold color scheme and the lozenge herald.

The Monon decided against E units. They opted for F units for the passenger trains in order to keep all the weight on the powered axles. The Indianapolis line (Second Subdivision) would have been the only part of the railroad suitable for E units. Amtrak learned this lesson during the 1970's and 1980's.

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