Train power & efficiency?

[Bizobinator]

With a train (& any vehicle really), it has a power rating and, under the burner/power source, it has an efficiency value. So, my question is: is the power rating the net/output power (after the efficiency has been applied), or is that the fuel consumption power rate (& the power delivered to the vehicle is modified by the efficiency)?

[TempiDrachen]

I drove a car for a bit with the default effectivity of 0.6 and then increased it to 10.6 so that any changes would be obvious. The speed of the car remained the same but the fuel consumption went way down.