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As a result of movement in the track in the #Salfords area, we have a speed restriction in place affecting @Southern and @TLRailUK trains. The good news is the work can happen safely with the railway open and it will involve counterfort drains, anchor rods and bags of ballast /1
The counterfort drains are dug by excavators and lined and filled with gravel, essentially like big French drains so water can drain away quicker /2 
Then the anchors are big steel rods which are inserted into the ground, but they have a head on them which hooks into the ground and then these are attached to the sheet pile wall to give even more stability /3
