Thread by @NetworkRailSE

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

Then the ballast bags will be placed as a temporary wall to provide even more resistance. Once we can ensure the earth has stopped moving, we will need to fix the track which has moved too /4

This will mean tampers coming into repair the track and install extra ballast where needed. We're sorry we can't give a timescale for the removal of the speed restriction, but we will keep you up to date as our works progress /5