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Network Rail had a blockade on the Brighton Mainline to replace life-expired tracks inside the Clayton Tunnel - a well known landmark down in Sussex. So I went for a look to see how it's done, and got to go for a walk inside the tunnel too!
Brighton Mainline Improvement Project Page : www.southernra...
The Clayton Tunnel Crash from 1861: en.wikipedia.o...
My thanks to Chris (as always!) and everyone from Network Rail for inviting me along, it's always a priviledge to be able to go on site visits like this.