Simplify the following text for a Grade 14 native English-speaking person.
Original: The steel mill has since been demolished to make way for the national headquarters of American Honda Motor Company , but the once double-tracked Torrance line was reballasted and rerailed with used welded rail in 2003 and is still in use for local runs by the Union Pacific Railroad .
Simplified: The steel mill has since been torn down to make way for the national headquarters of American Honda Motor Company , but the remaining part of the Torrance line - which once had two separate tracks - was rebuilt in 2003 and is still in use for local train runs by the Union Pacific Railroad .