37260 You can no longer unload wagons one-by-one. Click on the train  and they will be all unloaded.
 To be pedantic, you can only click on either the loco, or a loaded wagon.  It's possible to have unloaded wagons if your use the slider to send less materials than the capacity of the train.
 I think that's a bug. When implementing the "click anywhere on the train" feature, the person doing that implementation, did not realize not all parts of the train are always clickable. (And I don't think the bug will ever get fixed).