I see you visited the Czech Republic. I still remember you were interested in taking pictures of our old units CD 451 ([link]). Did you manage to catch any? By the way, a unit in the picture is heading to my hometown
I know it's too late to give you tips but in case you will travel to the Czech Republic again I suggest you to go to Praha-Libeň station (or Praha-Holešovice station but Praha-Libeň station is way busier). CD 451/452 units departs basically every half of an hour from Praha-Libeň, going through Praha-Holešovice to Roztoky. I believe they'll stay in service for couple of years on this line.