The Slovakian ZSSK class 861 diesel multiple units are brand new. They have been built by ŽOS Vrútky and the first ones were delivered to the Slovakian state railways ZSSK in two batches 2015-18. It is a 140 km/h fast three coach, partly low-floor diesel multiple unit with German MAN engines and with hydraulic transmission.
Picture from the Vranov nad Topl'ou station 2.7.2018 by Ilkka Siissalo.

A similar new ZSSK class 861 diesel multiple unit waiting for its departure time. Notice the slight difference in the buffers of these two trains. This no.003 is one of the preseries trains.
Picture from the Kosice station 3.7.2018 by Ilkka Siissalo.

Class 671 double decker electric multiple units are also very new trains. They have been built by Škoda and similar trains are in use also in the Czech Republic, in Lithuania and Ukraine. In Czech these trains are called by the name "City Elephant". Slovakian ZSSK has 19 of these units. They have a power rating of 2000 kW and a top speed of 160 km/h.
Picture from the Kosice station 3.7.2018 by Ilkka Siissalo.

A closer look at one of the new Škoda double decker electric multiple units of class 671.
Picture from Bratislava 19.3.2022 by Markku Salo.

These are exactly the same coach sets as in the "CityElefant" electric multiple units, but ZSSK has also bought some of these sets without the usual motorised wagon that usually comes along with the wagons. They are then used with a variety of different Škoda made locomotives.
Picture from the station of Kúty 14.7.2018 by Ilkka Siissalo.

Another view of the same train as above.
Picture from the station of Kúty 14.7.2018 by Ilkka Siissalo.

The other end of the same train as in pictures above. In this case power was provided by a very old class 240 electric locomotive. The type is nicknamed "Laminatka" because the body shell of these locomotives is made laminated glass fiber. The machines were taken into use in 1966 to 1969.
Picture from the station of Kúty 14.7.2018 by Ilkka Siissalo.

Another similar Škoda double decker electric train as shown above, but this one is again without the built-in motor wagon and is therefore marked as class 971 instead of 671. This means that there has to be a real locomotive at the other end, though you can't see it from here.
Picture from Bratislava 19.3.2022 by Markku Salo.

Slovakian ZSSK class 460 electric multiple units are already quite old trains. Typically - like here - they consist of two similar motorised units at each end and two or more middle coaches, which are similar to German "Mitteleinstiegswagen" coaches of the 1950s or early 1960s. These trains are known in Slovakia as "Elektrická jednotka 460". They were built 1974-78 in what then was Vagónka Tatra n.p. Studénka (now a part of Škoda). Each motor wagon's power rating is 2000 kW and top speed of the train is 110 km/h.
Picture from Kosice station 2.7.2018 by Ilkka Siissalo.

A closer view of one of the class 460 motor wagons.
Picture from Kosice station 2.7.2018 by Ilkka Siissalo.

This kind of old wagons are used as middle coaches in the class 460 trains. They are similra to old East German regional traffic coaches of the 1970s.
Picture from Kosice station 2.7.2018 by Ilkka Siissalo.

ZSSK class 813/913 railbuses are fixed two-car multiple units rebuilt from one one coach class 810 railbus and its motorless driving trailer, both heavily modernised and now permanently fixed as one unit. They are built 2006 to 2010. ZSSK has 44 of these trains.
Picture from Kúty station 14.7.2018 by Ilkka Siissalo.

These new railbuses of the Slovakian class 840 are thought to be the successors of the class 813/913 shown above. These are of the type GTW 2/6 (Gelenktriebwagen 2/6 = bending motor wagons with two axles motorised out of a total of 6 axles) made by Stadler Rail in Switzerland. They have a so called power pack module in the middle and just two motorless coaches on both sides of it.
Picture from Bratislava 20.3.2022 by Markku Salo.