The key question is when supply chain congestion eases in the US. The question to that answer is not yet, as a new Bloomberg report shows the US' largest containerized seaport in Los Angeles and Long Beach in Southern California (responsible for 42% of all containerized trade with Asia) has been hit with worsening rail delays.

Dwell times for rail-bound containers have been steadily increasing since February and are back to levels not seen since the major port bottlenecks of summer 2021. 

The Port of Los Angeles has recently enlisted help from the White House to clear a backlog of rail-bound containers that's tripled since February, taking up space on its docks and causing congestion. As of Monday, there were more than 28,000 rail-container units on the ground, about two-thirds of which had been waiting to be picked up for nine days or more. -Bloomberg

Increasing rail congestion comes as thousands of dockworker contracts across the West Coast are about to expire following unsuccessful negotiations between labor unions and major railroads. 

If dockworkers or railroad workers strike, normalizing supply chains would be delayed. There's also the risk of China's reopening, and the backlog of goods headed in containers for US West Coast ports could further snarl supply chains. 

Bloomberg also outlines that trucking woes and lack of warehouse space exacerbate bottlenecks for rail networks.