Ah, the train! It's difficult for me to judge objectively when a map features the Black Mesa train. dabs away a tear
But heck, I like the ambush. Oops, now I've spoilt it... the train moves nicely as it comes off the rail as well. And the last bit is winnable, which is good. You'll notice a few neat scripted sequences thrown in as well (in typical Black Mesa train-ride style :)). Great stuff.