You are right! That guy has some fantastic videos especially on the more technical side of things. He has videos with the loco traction motors in action during acceleration, wheel and suspension system movement during travel, under carriage videos, really unique and highly interesting stuff on his channel. This one showing hard suspension action on a loco running on a bad old track. It's pretty crazy when you think that the suspension of a 80+ tones vehicle works as hard as the one in a rally car. PS DTG: maybe you learn something from this and make the suspension in game dynamic so it moves with the wheels independent of the bogey like in real life.