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Hi Steve, what an interesting post.
I only have very limited knowledge from preservation Diesel interests, but, from past discussions with ex-engine men,I'm assuming this surging is to do with the slow response between engine Govenor and Govenor switches acting on the load regulator when calling for full power.
At all speeds the load regulator controls the excitation on the generator but at full load the response to changing track elevations and conditions will not be as quick to react causing over excitation and excessive power to be generated.
I believe this situation could also lead to flash over between generator and ground.
I'm sure there are more knowledgeable participants on the forum, so hopefully someone can enlighten you further.
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