NETWORK RAIL has revealed the detailed process of assessing the condition of the Forth Bridge.
It can take months for crews to inspect each of the 14 sections of the nearly 133-year-old structure.
Each part is physically touched by examiners every six years, while visual inspections take place annually.
Photo: Network Rail.
The more detailed inspections involve rope access teams scaling the bridge from top to bottom, with the process often taking up to four months to complete.
Once finished, a report is sent to structural engineers to evaluate.
Alongside the two types of examination, workers carry out underwater tests to check below the waterline.
Areas of concern can be inspected more frequently.
The most recent major refurbishment of the bridge took place between 2001 and 2011 and was carried out by Balfour Beatty.
Photo: Network Rail
Network Rail took to social media to share the process.
A spokesperson wrote: "Rest assured, even at almost 133 years old, the bridge is in great condition.
"We’re proud to be custodians of such an iconic structure."
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