An attempt to improve efficiency of train maintenance has prompted Amtrak to relocate 80 positions away from its long-time maintenance hub in Beech Grove.

Fifty-three positions specializing in wheels will be moved to Chicago and 27positions with locomotives will go to Wilmington, Del., said spokesman Marc Magliari.

After the restructuring, 475 workers will remain at the site, Magliari said. The local cuts will take effect before August.

The change is associated with a new maintenance philosophy that involves replacing parts at intervals recommended by manufacturers, he said. Under the prior approach, parts would be replaced on an engine or car on a different timetable.