Yes, we have been making
Yes, we have been making hybrid locomotive since the late 30s and the reason why it's called "hybrid" is that it has a diesel engine and electric motors. Thus the definition "hybrid".
The regular Prius, not the PHEV also uses an electric motor and according to your definition should also be an "electric vehicle", since after all, it also runs on electricity alone, albeit for a little while at slow speed.
The point is moot. A vehicle that has two sources of energy, an electric motor and a gasoline engine is a hybrid. If you can recharge the battery pack, it becomes simply a plug-in hybrid. An extended range electric vehicle is an oxymoron. It's electric or not. It doesn't matter if its a Series or parallel layout. It's just that simple and it takes away any confusion people have. But as long as GM uses the money graceously donated to lobby governments to accept the twisted definition of EREV, so it goes.