Agreed. The impact of the train ride on my brain remains unsurpassed, and it will never happen again.
It was 1998, it had never been done before, and little did we know at that point in the game that the rest of the game would be full of even more innovative stuff that Half-Life is now known for.
So Black Mesa Inbound is what I’m mostly looking forward to.
Off topic: Unreal’s second level (Nyleve’s Falls) also made an impression I’ll never ever forget: in the beginning, the moment you leave the crashed spaceship (Vortex Rikers) and you come into the open air: the atmosphere, the beautiful sights, bunnies, flying creatures, but especially the music.