I'm considering combining the cab of an MTH GP40 with the long hood of an MTH GP60M on the GP60M frame to create a GP60. Aside from the safety cab, where there any exterior differences between the GP60M and (for comparison's sake) an NS GP60? In photos I've noticed that the fuel tank for the GP60 appears longer that that for the GP60M (or that the GP60M has a longer frame). Are there any other external differences?
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