Credit: A Metro car derailed at a maintenance yard Monday after workers forgot to remove a safety block that keeps the cars from moving during repairs.

Forgotten safety block derails Metro car at rail yard

Push to expand free Metro rides in DC

Busy weekend means likely traffic snarls

DC area has 2nd-longest average commute in America

Metro GM: Terror threat ‘keeps me up at night’

Rush hour on Metro may improve, but ‘things will pop up’