Hello christo,
Your photo was great! I can give you some technical information to the diesel-engine:
The engine was the legendary SD 40-2 built by the electric motivedivision(EMD) from 1973-1976. Length over all 20.980 mm. Weight: 180 t. Power:2500 kW.
The Union Pacific Company and the Burlington Northern Company are the owners of this maschines. These companies have about 1000 Engines in their schedules.
It`s bad, that the companies have now no one of the legendary engines in their schedules.
Many model railroad companies have these engines in gauge 1:87 in their programm in DC.
Best regards and best wishes to you!
Erwin