Class of French 0-8-0 locomotives
Nord 4.001 to 4.075 and 4.636 to 4.990, also called "180 unités", were 0-8-0 locomotives for freight traffic of the "Chemins de Fer du Nord".
Construction history.
The locomotives were built in several batches by various manufacturers. 
Starting with 1879 a Belpaire firebox was installed in the newly built machines, and beginning with 1890 the locomotives were equipped with a cab. 
In 1921 the remaining machines were renumbered as follows: 
References.
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