The number of containers that lingered at terminals at the ports of Long Beach and Los Angeles before leaving by rail reached a new high last month, according to new data released Aug. 22, by the Pacific Merchant Shipping Association. The average dwell time for rail-bound cargo at the twin ports last month was 16.4 days, up 3.1 days from June’s 13.3 days and up 5.1 days from May (11.3 days). Last month’s 16.4-day dwell time average was the highest recorded by PMSA since it started tracking the data more than a year ago. Meanwhile, the average dwell time for…