Pavel , are you a chess player?  I am and feel when I make a move (post) - you are ready for me with another move (post), ha-ha, I like good competition, I never enjoyed playing with a week opponent , other then my wife.

 You are bringing good point with natural gas, I was actually looking into it and found that Hyliion  EV company  ( HYLN) does utilizing  natural  gas in their conversion kits which they will build for tracks. So, it will be kind of hybrid gas/electric. They even go father as bringing methane gas into mix, which will really double green on that… hmm , something to ponder. (draw? ;0)