The authorisation comes three days after Newag delivered eight Griffin locomotives ordered by PKP Intercity in June 2018.
The four-axle Griffin locomotive is equipped with ETCS level 2 baseline 3.4.0, and can haul up to 800 tonne passenger trains and up to 3200-tonne freight trains with a top speed of 160km/h.
Newag says the vehicles feature a high safety standard, comfortable interior, high tractive force and a modular design.
The units delivered for PKP Intercity are part of an order for 30 locomotives worth more than Zlotys 551.4m ($US 140.1m).
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