Madog. To the north was an industrial area of foundries, timber saw mills, slate works, a flour mill, a soda-pop plant and gasworks.

Porthmadog's role as a commercial port, already reduced by the opening of the Aberystwith and Welsh Coast Railway in 1867, was effectively ended by the First World War, when the lucrative German market for slate collapsed. The 19th-century wharves survive, but the slate warehouses have been replaced by holiday