Easter ..................................
" Lee ordered this army to evacuate the positions they had held east of Richmond and Petersburg for the last nine months when he learned of the disaster at Five Forks. The army was to pull out that night, April 2, 1865, and head west. Lee hoped to be able to get to the vicinity of Greensboro, North Carolina with his army, and unite his command with that of Joseph E. Johnston, and continue the fight. He was cut off and compelled to surrender at Appomattox. "
Railroads on the Railways required tracks for the trains to run on them these tracks earlier made up of iron for its heavy duty but soon enough realise that iron was not a very good option for tracks. Meaning drawbacks of using iron for example rusting is it was realised that Steel was a better option in making railroads.
Steel being made out of iron is heavy duty material yet it is not much prone to rusting. Just addition of certain minerals and carbon in iron steel forging is done making it heavy duty material.