They were also closely associated with settlements planned and built for their workers, with schools, churches and chapels alongside a full complement of housing.
Hefyd, roedd cysylltiad agos rhyngddynt ag aneddiadau a gynlluniwyd ac a adeiladwyd ar gyfer eu gweithwyr, gydag ysgolion, eglwysi a chapeli ochr yn ochr â nifer lawn o dai.