Nam-Ek's train throw is a greater strength feat than Thanos picking up the Hulk and body slamming him.
However, the OP said Nam-Ek takes the place of Hulk at the start of IW, when Thanos had the power stone. Did he use it against the Hulk? No. CAN he use it if he wanted to? Nothing in the OP states he can't.
Should make an interesting fight.
EDIT: Clarification.
Originally posted by NotAllThatEvilThis is disengenuous. When Many is sent him to sleep they still couldn't get the glove off. Thanks is strong, but Namek is strong and fast close.
And what strength feats put thanos on that level? Only out maneuvering the hulk. And even if thanos was going easy on cap, he still couldn't overpower him with one hand.