The locomotive rode on a pair of trucks of all-new design, known as the Hi-Ad, standing for 'high adhesion'.

During an evaluation on the Santa Fe Railway, the same traction motor blower on 636-2 failed and was replaced on three of four runs.

Hamersley Iron had their fleet rebuilt in the 1980s by Comeng, Bassendean with the Australian designed Pilbara cab.

The two former Cartier, ex-Alco demonstrator units stored on the Bath and Hammondsport Railroad for many years have been scrapped by a local contractor.

The WNY&P still operates M630 and M636 MLW locomotives, but these units were scheduled be removed from service in Summer 2019 and replaced by GE AC6000CWs that formerly served with CSX Transportation.