I can often find specific things in a multi-page thread by using Google. Here's how:
In the Google search window,
- type ogr, space, then next to that
- Paste the exact OGR forum topic title, space
- then type the word you want to find in the thread
- The first result is usually spot on (the exact page in a long thread). Open that link
- Using the your browser's "Find on Page" function (described by Rich) [Ctrl + F] type the word you're looking for.
For Example I if wanted to see the details of using styrofoam in @Mark Boyce's Blackwater Canyon build thread "Blackwater Canyon Line - December 17, 2021 - Wiring Finished, What's Next?" where he was recently talking about using styrofoam in his scenery work.
So the Google search would be "ogr Blackwater Canyon Line - December 17, 2021 - Wiring Finished, What's Next? styrofoam"