Most of the people on this forum won't have heard of a MAV V63 It's the one on the left but most of the people on this group would only know the loco on the right I downloaded it some time ago but with the instructions being in Hungarian I have not got it going. Try finding an online translator And just typing ? 90 mins after your original post won't get many responses - people have other things to do.
Is this the locomotive you are talking of? https://steamcommunity.com/sharedfiles/filedetails/?id=2730021688 There are some comments there which are not in my language, but if that is your language, they may be useful to you - I cannot tell. Otherwise, you might be able to contact the author there. John
OK, well then it probably goes without saying that you need to ask the question in the right forum. This one is specifically for Train Simulator Classic. Good luck. John
There are some videos of the loco on YouTube. It's not a tutorial, but you might see how it is started by watching this video.