Currently being Built by Gavin losely based on llanddulas the layout will be able to be operated by one person 

Below is a Digitized copy of an aerial photograph showing Dulas Railway Viaduct and surrounding area, taken by Ordnance Survey, 1986

here is a picture of the viaduct when it collapsted in 1879

During the rebuild of the viaduct

The Viaduct today 

Viaduct today

Railway viaduct (Jonathan Wilkins) / CC BY-SA 2.0