The tests will be used to verify parameters and performance, while also generating data to support the process of obtaining the authorisation to place in service.

ZSSK ordered 25 new electric trains in March 2018, divided into two versions: 13 two-car RegioPanter EMUs (class 661) and 12 four-car InterPanter EMUs (class 660). Both versions are single deck with a maximum speed of 160km/h, and can operate on both 3kV dc and 25kV 50Hz ac power supply. The trains are prepared for ETCS.

The new RegioPanter and InterPanter trains will operate services in the Žilina area, such as the lines from Žilina to Liptovský Milkuláš, Cadca, Puchov and Horní Lideč on the border with the Czech Republic.

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