Y gwahaniaeth rhwng diwygiadau o "Rheilffordd Chwarel y Penrhyn"

Tramffordd Llandygai
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(Tramffordd Llandygai)
 
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File:Llandegai Tramway en.png|Tramffordd Llandygai
File:Penrhyn Railway en.png|Rheilffordd y Penrhyn (1801-1878)
File:Penrhyn Quarry Railway en.png|Rheilffordd Chwarel y Penrhyn (1878-1962)
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