It wasn't quite as simple as I had thought. This is what actually happened:
0623 D GWUKB WUK4485 Lviv
0641 D GWUKF WUK7910 Ohrid
0647 A GWUKL WUK3775 Constanta
0649 A HALWZ WZZ2501 Riga
0657 A HALWA WZZ1801 Wroclaw
0702 D GWUKJ WUK7674 Kosice
0703 A HALYJ WZZ8001 Vilnius
0708 A GWUKH WUK3615 Suceava
0710 D GWUKC WUK4489 Tallinn
0713 A HALWO WZZ4301 Sofia
0715 A HALPS WZZ3301 Cluj-Napoca
0717 D GWUKI WUK4459 Larnaca
0720 A HALPM WZZ3753 Craiova
0721 A HALXV WZZ1301 Warsaw
0724 A HALWS WZZ3651 Iasi
0736 D HALXQ WUK4554 Bourgas
0738 A HALWX WZZ1001 Katowice
0742 A HALXT WZZ1601 Gdansk
0745 A HALVB WZZ2201 Budapest
0755 A HALWE WZZ7851 Debrecen
0800 A HALXM WUK5001 Krakow
0807 D HALYJ WZZ8002 Vilnius
0811 D HALWZ WZZ2502 Riga
0816 A HALWV WUK7701 Skopje
0817 D HALWA WZZ1802 Wroclaw
0820 D HALWO WZZ4312 Sofia
0836 D HALXI WZZ3001 Bucharest
0838 D HALPM WZZ3754 Craiova
0842 D HALWS WZZ3652 Iasi
0849 D HALXT WZZ1302 Warsaw
0859 D HALVB WZZ2202 Budapest
0903 D HALXU WZZ1602 Gdansk
0908 D HALXM WUK5002 Krakow
0912 D HALWE WZZ1002 Katowice
0913 D HALWX WZZ7852 Debrecen
0915 D HALPS WZZ3302 Cluj-Napoca
0922 D HALWV WUK7702 Skopje
0958 D HALXI WZZ3002 Bucharest
38 movements, 17 arrivals, 21 departures.