The Associated Society of Locomotive Engineers and Firemen (ASLEF) is a British trade union representing train drivers. It is part of the International Transport Workers' Federation and the European Transport Workers' Federation. At the end of 2018 ASLEF had 22,424 members.

What does ASLEF do?

ASLEF is Britain's trade union for train drivers. Its 21,000+ members are employed in the train operating companies, the freight companies, London Underground and Light Rapid Transport.

Who do ASLEF represent?

ASLEF is a craft union representing train drivers in England, Scotland and Wales. Over its 140-year history, the union has brought together train drivers to organise as one against oppression and abuses by railway owners, governments and management.