The P class are a class of diesel locomotives built by A Goninan & Co, Bassendean for Westrail between 1989 and 1991.

In 1988, Westrail placed an order for 15 CM25-8 Dash 8 locomotives for bulk grain and general freight haulage with A Goninan & Co.[1] A 16th was later ordered[2] followed by a 17th funded by AMC Mineral Sands.

[3] In 1997, the class was fitted with Locotrol equipment to allow them to operate in top and tail formation.

[clarification needed][5][6] In early 2014, all were included in the sale of Australian Railroad Group's Western Australian operation to Aurizon.

[clarification needed][8]