ap photo Freight train cars sit in a Norfolk Southern rail yard on Sept. 14 in Atlanta. Business groups are increasing the pressure on lawmakers to intervene and block a railroad strike before next month’s deadline in the stalled contract talks.

OMAHA, Neb. — President Joe Biden on Monday asked Congress to intervene and block a railroad strike before next month’s deadline in the stalled contract talks, and House Speaker Nancy Pelosi said lawmakers would take up legislation this week to impose the deal that unions agreed to in September.

“Let me be clear: a rail shutdown would devastate our economy,” Biden said in a statement. “Without freight rail, many U.S. industries would shut down.”

In a statement, Pelosi said: “We are reluctant to bypass the standard ratification process for the Tentative Agreement — but we must act to prevent a catastrophic nationwide rail strike, which would grind our economy to a halt.”

Pelosi said the House would not change the terms of the September agreement, which would challenge the Senate to approve the House bill without changes.

The September agreement that Biden and Pelosi are calling for is a slight improvement over what the board of arbitrators recommended in the summer. The September agreement added three unpaid days off a year for engineers and conductors to tend to medical appointments as long as they scheduled them at least 30 days in advance. The railroads also promised in September not to penalize workers who are hospitalized and to negotiate further with the unions after the contract is approved about improving the regular scheduling of days off.

Hundreds of business groups had been urging Congress and the president to step into the deadlocked contract talk and prevent a strike.

Both the unions and railroads have been lobbying Congress while contract talks continue. If Congress acts, it will end talks between the railroads and four rail unions that rejected their deals Biden helped broker before the original strike deadline in September. Eight other unions have approved their five-year deals with the railroads and are in the process of getting back pay for their workers for the 24 percentraises that are retroactive to 2020.

If Congress does what Biden suggests and imposes terms similar to what was agreed on in September, that will end the union’s push to add paid sick time. The four unions that have rejected their deals have been pressing for the railroads to add that benefit to help address workers’ quality of life concerns, but the railroads had refused to consider that.

Biden said that as a “a proud pro-labor president” he was reluctant to override the views of people who voted against the agreement. “But in this case — where the economic impact of a shutdown would hurt millions of other working people and families — I believe Congress must use its powers to adopt this deal.”

Biden’s remarks and Pelosi’s statement came after a coalition of more than 400 business groups sent a letter to congressional leaders Monday urging them to step into the stalled talks because of fears about the devastating potential impact of a strike that could force many businesses to shut down if they can’t get the rail deliveries they need. Commuter railroads and Amtrak would also be affected in a strike because many of them use tracks owned by the freight railroads.