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Class 37 power is Maximum: 55,500 lbf (247 kN) with a continuous output of: 35,000 lbf (156 kN) @13.6 mph (22 km/h)
Class 66 power is Maximum: 91,900 lbf (409 kN) at starting with a continuous output of : 58,500 lbf (260 kN) at 15.9 mph (25.6 km/h)
So two class 37's with decent engines and bogies fully maintained will out perform one class 66 on paper
the Class 66 with be more economical on fuel and emissions but the 37's will sound like they are working and look so much more like a real loco should
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