Bill Ackman warns the US economy is heading for a 'train wreck' as the Fed hikes interest rates again

• Bill Ackman highlighted risks to the economy and smaller banks as interest rates keep rising even with a banking crisis. 
• The billionaire investor warned the US economy is heading for a "train wreck" as the Fed raises rates again. 
• Ackman also slammed Treasury Secretary Janet Yellen for walking back on plans to support depositors. 

Billionaire investor Bill Ackman fears the US economy is heading for a "train wreck" as the Federal Reserve presses ahead with interest-rate hikes – and Treasury Secretary Janet Yellen throws cold water on plans to support depositors.