Leasing Company Porterbrook and train operator Northern are to jointly develop an innovative rolling stock solution by introducing diesel power packs to Class 319 units. The novel concept will see the units dubbed Class 319 'Flex', and by fitting two diesel-powered alternators, one under each of the driving trailer cars, it will allow the unit to operate seamlessly over electrified and non-electrified routes. The project is supported by Rail North, representing local authorities in the north of England.
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