These locomotives were built by GE as series C30-7Ai and used in the US. In the early 2000s, 19 such locomotives were transferred to Estonia. Locomotive 1564 was the first to get the upgrade back in 2016-2017 using upgrade packages from CZ Loko. The upgraded locomotives are generally referred to as type C30-M.

Technical specifications:

Engine: CAT 3512C
Power output: 1,550kW
Power transmission: AC/DC
Max speed: 100 km/h (80 km/h in Estonia)
Wheel configuration: Co’ Co’
Weight: 138 tonnes
Gauge: 1,520 mm
Intended use: heavy shunting / mainline

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