The Train
I mostly watched this because it was directed by John Frankenheimer, who also did Ronin, one of my favourite action movies ever.
I don't normally do old black and white films, and there was plenty of the corniness, crap acting and terrible dubbing that typically puts me off them, but holy crap, the "special effects" in this mostly consisted of actually crashing trains and blowing up an entire rail yard for real with a metric f**kton of dynamite. And you can't beat doing stuff for real like that.