418s do the Debrecen -Romania runs on Line 105, changing to a CFR 60 at Valea lui Mihai.
Most of the Line 110 Debrecen to Mateszalka/Feheregyarmat services are 418, as are most of the services across the Hortobagy national park on Line 108 via Tiszafured to Fuzesabony. Note that the diagram that includes the 10.45 departure from Debrecen is usually a BZmot railcar and trailers.
ANote that a short section at the Debrecen end has recently been bustituted- to free up the line for freight trains! Buses were departing 10 minutes before the scheduled time, not sure if this is still ongoing though.
Loads of electric hauled stuff on the mainline.
PS this may come in handy for you- location of every MAV train in Hungary, complete with loco/unit fleetnumber
PPS if you are staying in Debrecen, Calico Jack Pub (tramstop Bem Ter) does excellent Hungarian food at a good price- expect to leave with a full tummy! Csokonia Etterem is very good too, but a bit pricier and slightly more formal. HTH