My first thought was that it’s based on airboat puzzle with blue barrels in HL2 where you need to lift some wooden logs to create a ramp. But, just like in HL, it can be skipped by exiting the train before it falls and just jumping to the other side of water tank.
Yeah, that’s very well paced. I was like “I’ll just drop to a room below with some soldiers” and then I saw a garg smashing through the door and I’m like “HOLY SHIT” and I run for my life - that was actually the most hectic little moment in the whole game on my 1st playthrough