This pair of single track tunnels carry the Clydebank to Dalmuir (North British Railway) line under the Forth and Clyde Canal between Clydebank (to the east) and Dalmuir (to the west).
For the line's construction the Forth and Clyde Canal was deviated slightly to the south, creating two bends in the canal where there had been one before. The original course of the canal was obliterated not long afterwards.
The '23' is due to this being the 23rd structure on the line going west from Hyndland.
Nearby stations Dalmuir Riverside Dalmuir [1st] Dalmuir Singer Kilbowie Singer Workers Platforms Kilbowie [1st] Clydebank Clydebank East Clydebank Riverside Drumry Yoker Old Kilpatrick Kilpatrick Yoker Ferry | Lidgerwood Siding Dalmuir No 25 Tunnel Singer Timber Yard Turners Asbestos Cement Works Royal Naval Stores Depot Dalmuir Dalmuir Iron Works Singer Works Post Office Submarine Cable Depot Dalmuir Kilbowie Swing Bridge Dalmuir Swing Bridge Dalmuir Shipyard Dalmuir West [Tram] Singer Works Locomotive Shed Clydebank Central Junction Newshot Island |
Location names in dark blue are on the same original line. |