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 .