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The diseasesel was there to use it's dynamic braking to provide additional load as part of the running in process.
As far as black smoke is concerned that is produced when too much oil or not enough air is going through the fire. This usually happens when there is a need to increase the firing rate by adding another burner. Black smoke is unburnt carbon and producing it is inefficient because it is not extracting the greatest heat from the fuel. Remember that the fireman on this trip would be learning how to control the fire on that locomotive which has a bigger firebox than the only other operating Union Pacific locomotive. 4014 was converted to oil as part of its restoration.
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