By Natalia Drozdiak and Matthias Goldschmidt

FRANKFURT--The cargo unit of German state railway Deutsche Bahn AG said Monday that other companies are joining its suit in Germany which claims damages from 13 airlines for colluding to inflate airfreight fees.

With the additional companies, the combined suit filed at the regional court in Cologne now totals 2 billion euros ($2.26 billion) and about EUR900 million in interest payments, a spokesman for the company said. While auto supplier Robert Bosch GmbH confirmed it was taking part, Deutsche Bahn declined to name the other companies joining the suit.

According to a report by the German weekly magazine Wirtschaftswoche, Swiss logistics companies Kuehne + Nagel AG (KNIN.VX) and Panalpina Welttransport AG (PWTN.EB) are also joining the lawsuit.

Panalpina declined to comment and Kuehne + Nagel wasn't immediately reached.

Deutsche Bahn's own claims in Germany still stand at around EUR1.2 billion and EUR560 million in interest payments. Their claims in the U.S. could reach up to $1.1 billion.

The lawsuit, which The Wall Street Journal first reported last year, targets 13 airlines including Air France-KLM SA (AF.FR), British Airways (IAG.LN), Deutsche Lufthansa AG (LHA.XE) and Australia's Qantas Airways Ltd (QAN.AU).

Write to Natalia Drozdiak at natalia.drozdiak@wsj.com and Matthias Goldschmidt at Matthias.Goldschmidt@wsj.com

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