Aren't most trains electric anyway? Over here(in Poland) I don't think I've ever seen a train that doesn't run on electricity.
As only ~65% of the polish rail network are electrified, I'm sure there are still plenty of Diesel powered trains operating in Poland.
Some more: https://pl.wikipedia.org/wiki/Lista_spalinowych_zespo%C5%82%...
This view was common for me some years ago: https://commons.wikimedia.org/wiki/SM42#/media/File:SM42-838...
I said "diesel" as a mental shortcut for diesel and diesel-electric, but certainly not for electro-diesel.