Excerpt:
Germany signed the "guest worker" agreement with Turkey 50 years ago which allowed companies to fill empty workplaces with Turks and changed the country forever. Süleyman Cözmez was one of the thousands who came - and and stayed.
Driven by hopes of a prosperous life for his family, Cözmez pushed fear and doubt to the back of his mind as he packed his suitcase and boarded one of the special trains from Istanbul to Cologne.
Cözmez had been invited to work in Germany by car manufacturer Ford who, like many companies in the country at the time, was desperately trying to build up its workforce.