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If it operates with a Diesel Hydraulic engine then its fine - you'll have to look into it yourself really, I'm not listing every diesel hydraulic as there are loads!
In the UK a Hydraulic is generally a Class 35, Class 42 or a Class 52. But as jordy says there are plenty of others not just UK based the Germans had quite a thing with Hydraulic designs at one point.
Well at least I have a good number of photos to choose from. However I don't have any diesel hydraulic locomotive shots, only multiple units. I think the multiple units can be just as attractive especially in certain liveries. Looking forward to seeing what everyone else is going to put up.