Oct 19 - Canadian National Railway Co said on Tuesday Chief Executive Officer Jean-Jacques Ruest will retire at the end of January.

The country's largest railroad operator also reported a 9.5% rise in third-quarter adjusted profit as it shipped more coal, petroleum and chemicals. ($1 = 1.2365 Canadian dollars) (Reporting by Abhijith Ganapavaram and Amruta Khandekar in Bengaluru; Editing by Devika Syamnath)