Original: The British Rail Class 357 "Electrostar" alternating current (AC) electric multiple units (EMUs) were built by ADtranz (now owned by Bombardier Transportation)  at their Litchurch Lane Works in Derby, England, in two batches from 1999 to 2002 at a cost of approximately £292 million.
Simplified: The British Rail Class 357 "Electrostar" alternating current (AC) electric multiple units (EMU) were built by ADtranz, Derby (now owned by Bombardier Transportation) from 1999 to 2002 at a cost of approximately £350 million.