Right, and now add a train in this page from station X to station Y, which you might have seen with this loco. Ok?
Now you will be expecting that this train will get added here in this loco page. Right?
But I am 100% certain, that it's not gonna happen. Instead, this specific loco (with this road number) will get added in that particular train page. And that's where the problem is, because it's against the policy.