[1] A unique modification is the wide cab version of the 2,000 hp (1,500 kW) U20C used on the 1,067 mm (3 ft 6 in) gauge Indonesian railroad and operated by PT Kereta Api Indonesia (Indonesian National Railway Company).

The wide cab was built by Goninan Locomotive Work (now UGL Rail) in Australia.

The first batch is number 01-12 which were imported from GE Transportation in Erie, Pennsylvania, United States.

Since Kereta Api Indonesia's 2011 rebranding, CC 203s were then repainted with KAI's current locomotive liveries.

Class CC 203s were built to commemorate 50 years of Proclamation of Indonesian Independence in 1995 and was initially built to haul Perumka's then-new Argo trains: the JS950 Argobromo and the JB250 Argogede; Perumka would then launch several other Argo trains.

The overall shape is similar to other Indonesian CC 203s, but the C20EMP has a Brightstar Sirius on-board computer to control the propulsion and transmission, for also better fuel economy and lifetime.

All the CC204s previously used for hauling coal trains in South Sumatra now replaced by CC206 (CM20EMP) from Java.

CC 204 locomotives still used a livery featuring two blue stripes of different shades (the lighter blue stripe above the darker blue stripe) and without the Indonesian Ministry of Transportation logo in the short hood and the former Indonesian Railway Public Corporation (Perumka) logo (inherited by its successor Kereta Api Indonesia (KAI) until 2011).

After strip down inspections and maintenance, the locomotive was put back on revenue service.

In contrast to the Indonesian U20C model which uses a wide cabin type and was designed by UGL Rail, the Brazilian U20C model still maintains the international standard cabin type, namely box-shaped and designed by Brambilla.