Class 500
There was also the similar NS Class 500. The difference between the two classes is that Class 600 has a "6KT" diesel engine of 400 hp (294 kW) and a Knorr braking system for train use, a Class 500 has a "6K" diesel engine of 350 hp (260 kW) and only an engine brake.
Read more about this topic: NS Class 600
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