MPs have called for the Department for Transport to "get its house in order" after uncovering "basic errors" in the way it run the West Coast franchise competition.
The department was forced to reverse its decision to award the £5 billion franchise to FirstGroup last October after a legal challenge from rival bidder Virgin Group.
The latest report by the Public Accounts Committee finds that managers had no oversight in the bidding process and failed to respond to early warning signs that things were going wrong.
Committee chair Margaret Hodge said the competition would cost the taxpayer £50 million "at the very least".
More top news
A manhunt is underway after gunmen dressed in women's clothes and SWAT team uniforms attacked a boxing event in Dublin, leaving a man dead.
Thousands of junior doctors and their supporters, wearing surgical masks, will hold a demonstration over pay and conditions.
The eight-month-old female pup, which was severely underweight and dehydrated, was asleep in a dining booth.