Hello!

Apologies if I miss something obvious. This is the first time I created antimatter capsule and I put it into cars and trains but they seem not to give any bonus to acceleration and top speed.

What should I do to confirm this?

Thank you.
Kind regards,
Ivan

Maybe I made a mistake. When you change the fuel the old one is not emptied, so the acceleration was boosted after a time when the old fuel was consumed. (The acceleration changed to 200% when hoovering the cursor over the car).

Without advanced electric engine I managed to reach (with car) 140 km/h and with advanced electric engine 170 km/h.

Are these results correct?

Yes, and also remember that:
"Additional electric engine for vehicles (cars, tanks, locomotive...), increase max speed and acceleration (excluded for Locomotives, in that case it increase only the acceleration a bit, but not the max speed)."