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 - Minffordd railway bridge (over Cambrian Line)
- UB - Pont Cae Ednyfed (Minffordd - Porthmadog Bypass)
- UB - Y Garth Road Bridge (Gwyndy Bank)
- UB - Ty Fry Bridge
- UB - Capel Nazareth Bridge
- UB - Penrhyn pedestrian underpass
- UB - Tan y Bwlch Bridge
- UB - Coed y Bleiddiau
- OB - Rhoslyn Bridge
- UB - Rhoslyn Bridge (Two entries for obvious reasons becasue of its loop nature)
- UB - Cwmorthin Bridge
- OB - Footbridge 1
- UB - Dolrhedyn Road Bridge
- OB - Footbridge 2
- OB - Footbridge 3
- OB - Footbridge 4
- UB - Barlwyd Bridge
- OB - A496 Bridge
- OB - Benar Road Bridge
- OB - Dorfil 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 - Gwyrfai Viaduct
- OB 1 - A487 Road, Dinas Junction
- UB 6 - Cae Moel
- OB14 - Pont Wernlas Ddu Bridge
- UB24 - Gwredog Isaf Bridge
- UB51 - Pont Betws Garmon Betws Garmon
- OB53 - Betws Garmon Road Bridge
- UB56 - Pont Tros y Gol
- OB62 - Pont Cerrig y Rhyd
- UB64 - Plas y Nant Bridge Afon Gwyrfai
- OB71 - Castell Cidwm
- UB95 - Glan yr Afon Viaduct (Dingle Bridge)
- OB123 - Pitt's Head
- UB125 - Pont Rhyd y Gors
- OB173 - Bryn y Felin Road bridge
- UB174 - Bryn y Felin River Bridge
- UB182 - Nantmor road bridge
- UB196 - Pont Ynysferlas
- UB199 - Pont Dylif
- UB212 - Pont Croesor
- OB...... - Pont Bodawen, Porthmadog Bypass flyover (No construction number)
- UB...... - Pont y Cyt
- UB221 - Britannia Bridge