The C30-7 is a 6-axle diesel-electric locomotive built by GE Transportation Systems between September 1976 and May 1986 as an updated U30C with a 16-cylinder 3,000 horsepower (2,200 kW) FDL-series diesel engine.

Externally similar to the GE C30-7 model, six tall hood doors per side (in place of eight) showed it had a 12-cylinder (rather than 16-cylinder) prime mover.

[2] In 2003 19 C30-7As were rebuilt and exported to Estonia as C30-7Ais to be used by EVR (Eesti Raudtee) which at that time was privately owned.

In 2018, Operail (formerly EVR Cargo) announced it had completed its first conversion of the series with #1564. International Railway Journal reported, "Only the frames and bogies of the original locomotive were retained and the C30-M features a new centrally-positioned driver’s cab and a 1.55MW Caterpillar 3512C HD diesel engine."

Operail's redesign makes the units suitable for shunting and line haul.