The head of Metro’s escalator and elevator department is taking over its track and engineering services unit.

Metro officials said Tuesday Rodrigo Bitar will become assistant general manager for the agency’s transit infrastructure and engineering services division, which has 4,800 employees. He will replace Rob Troup in that position. Troup recently took over as the number two at Metro, replacing Dave Kubicek as deputy general manager of operations.

For the last three years, Bitar served as general superintendent for Metro’s escalator and elevator division.

Bitar joined Metro in 2008 and worked on the quality assurance group, which supported the 2000, 3000 and 5000 series rail cars. Those rail cars have had troubles with brake parts falling off of them.

Prior to joining Metro, Bitar worked for Delphi Automotive and General Motors Corp.