That is called a hybrid, not a EV. Hybrids have a good history of working well in many applications similar to pickup trucks. They have fantastic torque, great fuel efficiency, and are very good at towing and getting unstuck. Almost all trains sold today are either EV's or hybrids. The best ice breaking ships are EV's or hybrids.
Much like hybrid diesel electric trains are real. But you can make this stuff up. Decades of engineers have worked hard to make this stuff up.
You have a choice between an electric drive system, or a mechanical drive system. There is such a strong argument for an electric drive system, that almost all trains have them. It is more simple than a mechanical drive system. There are much less gears and shafts and stuff. That is why almost all trains have gone to the electric drive system.
How are you not getting this?