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Diesel Electric is a great combo. Diesel generates the efficient power and the electric motors develop amazing torque from zero revs.

That's pretty much what I came up with using logical reasoning. I could have just looked it up.

Yes, the tops of the rails are radiused as well to help cope with the moving wheel geometry. We (Railways Courier service which was bought by NZ Post) were on the same frequency as workshop. There...

The bogies bit is true of modern locos (though the effect would be minimal), but in the day we standardised it was all steam locomotives that had the large fixed drive wheels in the middle, with...

The hole for the train is the same size. The gauge is just the gap between the wheels. What makes it cheaper?

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Engineering wise that makes no sense whatsoever. Narrow gauge on tighter turns would lead to instability. The main thing that would determine the tightness of a turn would be the length of the...

Close-ish. There were a number of gauges used until they standardised , much like here. Unfortunately they settled on a stupidly narrow standard gauge here.