The 25 Class, manufactured by EMD and classified as the EMD GM GT18LC-2, was originally ordered for shunting purposes but are strong enough to be used for mainline services, which is its current duty on the railway. The first batch of 12 arrived in 1991, and the second batch in 2002. The first batch of 12 locomotives bear the names of Malaysian islands, while the second batch of 5 bear names of precious stones.

The Class 25 locomotive was manufactured by EMD, a subsidiary of Progress Rail, a Caterpillar company. They were not manufactured by the competitor GE.
Thanks for the heads up, I have updated the info accordingly.