Bridges
It is not envisaged that this section will cover culverts, only locations where major structures are involved.
There are two categories of bridge. One that carries something over the railway, designated OB for Overbridge, and one that carries the railway over something, designated UB for Underbridge.
Bridges on the FR line are not numbered.
Bridges on the WHR line were lettered sequentially from Caernarfon to Dinas Junction, and numbered sequentially from there to Porthmadog during the construction period. However for operational purposes they have now been marked with new numbers based on distance from Caernarfon, in kilometres to two decimal places, referred to 20.00 at Caerrnarfon, prefixed OB or UB as appropriate. For full explanation see Bridge Numbering On The WHR. However this does not explain why the bridge at Caernarfon also has the number 1...
Festiniog Railway (in order from Porthmadog)
- OB - Rhiw Plas
- UB - Minffordd Cemetery Bridge
- UB - Pont Cae Ednyfed (Minffordd - Porthmadog Bypass)
- UB - Y Garth Road Bridge (Gwyndy Bank)
- UB - Capel Nazareth Bridge
- UB - Penrhyn pedestrian underpass
- UB - Tan Y Bwlch Bridge
- OB - Rhoslyn Bridge ) Two entries for obvious reasons
- UB - Rhoslyn Bridge ) of its loop nature
- UB - Afon Cwmorthin Bridge
- UB - Dolrhedyn Bridge
- UB - Afon Barlwyd bridge
- UB - CEGB Road bridge
- OB - Benar Road Bridge
Welsh Highland Railway (in order from Caernarfon - Construction numbers shown. Operational numbers may be added later)
- OB A - Caernarfon Station footbridge (Datum point 20.00 kilometre for distance references)
- UB E - Pont Seoint
- UB J - Bontnewydd Viaduct, Afon Gwyrfai
- OB 1 - A487 Road, Dinas Junction
- UB 6 - Cae Moel
- OB14 - Pont Wernlas Ddu Bridge
- UB24 - Gwredog Isaf Bridge
- UB51 - Afon Gwyrfai Bridge Betws Garmon
- OB53 - Pont Betws
- UB56 - Cae Hywel - Pont Dros y Gol
- OB62 - Pont Cerrig y Rhyd
- UB64 - Plas y Nant Bridge Afon Gwyrfai
- OB71 - Castell Cidwm
- UB95 - Glan-yr-Afon Bridge (Dingle Bridge)
- OB123 - Pitt's Head
- UB125 - Pont Rhyd y Gors
- OB173 - Bryn y Felin Road bridge
- UB174 - Afon Glaslyn Bridge (Bryn-y-felin)
- UB182 - Nantmor road bridge
- UB196 - Afon Nanmor Bridge
- UB199 - Afon Dylif Bridge
- UB212 - Pont Croesor
- OB.... - Porthmadog Bypass Bridge (Temporary name until completion)
- UB221 - Britannia Bridge
