56001-030 built in Romania. We worked a lot of these when i was based at Toton. They weren't as well put together as the BREL built versions and not as user friendly. For instance the Goods/Passenger changeover switch (This sets the train brake to release quickly for a passenger train, slower for a freight train to reduce "snatching") was located next to the distributor, just behind the cab on a BREL built example, but halfway down the "A Bank" side of the engine on a Romanian 56, meaning that when you checked the switch on prep you had to squeeze down the cramped A Bank side, generally getting covered in oil and grease in the process, and fumbling around for it in almost total darkness as the engine room lights weren't brilliant. 56 horns were also notorious for sticking, necessitating easy access to the isolating cock. On a BREL this was under a flap conveniently situated by your right foot. On a Romanian one you had to get your screwdriver out and remove the panel underneath the stove on the secondmans side to access it. If you had a secondman he could do this, otherwise you had to stop the train and do it yourself.
On the other hand, the Romanian one's seemed to build up power a lot more quickly than the BREL built one's, and were real flyers!
As built, the Romanian versions had the plate over the horn, as opposed to the grid, although early BREL examples also had the plate. As time went on a few of the Romanian one's gained a grid, mostly as a result of collision repair. I remember 004 certainly had a grid at one end, maybe even both i don't remember.
That's all i can remember off hand, but when i get a chance i'll look out my old 33056 manuals and see if they detail any other differences.
Hope this helps.