I've got Maszyna EU07-424 v. 220204 and I've got the sound. hmm.. Check .mmd files of electric locomotives and EMUs, try to modify this file a bit in the part where is the bzyczek.wav, put there another sound (like loud siren [The siren from ST44 locomotive is good, search for it in sounds folder], etc) and check it work, or not.
PS. sorry my poor english.