I happened to notice today, there's a little bit of inconsistency in the "found on map" feature of the Search system:
Specifically, when searching for products on the map, it's finding storages, machines, belts, and trucks- the currently-selected one is visible coming up the ramp- but completely ignoring trains that might be loaded with the product, like the one selected (and in the middle of loading...)
Before you ask, the search was started while the game was paused. That's important because the results aren't live, so a search started before the train started loading would be expected to miss it.
Update 4.1 | v0.8.4 (b587).