The British Rail Class NUMBER@1 electric multiple units , also known as `` Blue Train '' units , were introduced in NUMBER@2 for the electrification of the North Clyde and the ORGANIZATION@1 lines in LOCATION@1 .

They are also known as `` Blue Train '' units . They were introduced in NUMBER@2 for the electrification of the North Clyde and the ORGANIZATION@1 lines in LOCATION@1 .
