re-railing
/ˌriːˈreɪlɪŋ/noun
1The action of placing a derailed train, carriage, etc., back upon the rails; an instance of this.
2The action of supplying a line, track, etc., with new rails.
Origin
Late 19th century; earliest use found in Lockwood's Dictionary of Mechanical Engineering. From re-rail + -ing.