NKP 765 has been known to run passenger trains without a diesel for HEP. Often Railroads will require a diesel to be run on point for safety reasons. That way their engineer can drive the train, he knows the route & such. The few RRs that let steamers on point, have a regular steamer crew (like UP's) which can run the engine with a line-certified driver.
As for HEP. I believe most steam excursion cars have generators or a generator car for power.
peter
As for HEP. I believe most steam excursion cars have generators or a generator car for power.
peter