Seen on another forum, here's a little update on what's going on to address the issue with the couplers on Lionel's new milk cars. It's an excerpt from an email sent by Stu Rankin (NOT LionelLLC) to METCA members about the METCA custom-run milk cars:
"...We've worked with the Lionel Engineering Team and the Lionel Production team, who have in turn worked with the factory....The coupler issue has been identified. New sample couplers are going to be made, they will be thoroughly tested by Lionel, and then new couplers will be produced. The new couplers will feature improved performance and will be used on the replacement run of Brookside and Riverside cars. The improved performance couplers will also be available as a replacement from Lionel for our already delivered PRR and LIRR milk reefers if you also ordered those cars. As mentioned, a fair amount of testing and production has to occur before we have a date for availability of replacement couplers which is also the critical path for scheduling the delivery of the replacement Brookside and Riverside cars...."