Bookings were down 50 percent from last year and cancellations were up 300 percent, he wrote.

“At this rate,” Mr. Gardner wrote, “we believe we will likely suffer the loss of several hundred millions dollars in revenue during this fiscal year, and we might lose more.”

The blow to Amtrak’s business came as its financial performance had been improving and its executives had expected to report its first operating profit this year. Amtrak, which owns and operates Pennsylvania Station in Manhattan, had already suspended three daily nonstop trains between New York and Washington.

N.Y. Fed works to make sure money flows smoothly.

The Federal Reserve Bank of New York on Wednesday expanded the size of its so-called repurchase operations, which are essentially short-term loans to eligible banks. The New York Fed has been carrying out market interventions since October to keep money flowing smoothly between banks and other financial institutions.

Starting Thursday and continuing through April 13, the Fed will offer at least $175 billion in daily overnight repo operations — up from $150 billion — and at least $45 billion in two-week repo operations twice a week, according to the statement.

The Fed will also offer three one-month repo operations of at least $50 billion.

“These operations are intended to ensure that the supply of reserves remains ample and to mitigate the risk of money market pressures,” the New York Fed said in a statement.

It was the second time this week that the Fed ramped up its offering of repurchase agreements and came as investors are increasingly concerned about proper functioning of the financial system. Some economists are expecting the Fed to do more in the coming week, like mobilizing swap agreements that help foreign central banks keep dollar funding flowing in their economies or announcing an extension to the Fed’s Treasury bill purchase program.