Golden Wonder has clinched a contract to supply crisps to East Coast Trains, which caters for more than 18-million passengers every year.
The snacks will be sold on 137 weekday services on the East Coast Main Line between London and Scotland.
Andy Symonds, human resources manager at Golden Wonder, said: "Any increase in sales volumes adds to the long-term security of jobs in the company.
East Coast Trains has confirmed it has replaced a rival brand and is now selling Golden Wonder on its inter-city runs.