John Thomas (1838-1905) with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

A mixed train on Pont y Gelli (the wooden viaduct) with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

A view of a returning quarrymen's train at Tan y Manod with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

A view of Little Wonder, taken from in front of the Duffws Goods Shed with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

James Spooner at Duffws with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

John Thomas's view of Blaenau Ffestiniog from Graig Ddu with permission of Llyfrgell Genedlaethol Cymru / The National Library of Wales

Little Giant at Duffws with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

Little Wonder at Duffws with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

Merddin Emrys at Duffws with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

Merddin Emrys at Duffws, with Little Wonder to the right with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

Pont y Gelli under repair with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

Rhiwbryfdir village and Pont Goch (Oakeley Viaduct) with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

Taliesin at Duffws with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

The Glanypwll area of Blaenau Ffestiniog taken from Llechwedd Quarry

The Princess at Diphwys station with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales

Welsh Pony at Duffws with permission of Llyfrgell Genedlaethol Cymru/ National Library of Wales