First of all, i have to say that i really love the ISR Set, and i'm really looking forward to Version 0.7!!
However, i do have a small suggestion:
There are a lot of tiles which are initially empty, and fill up more and more depending on how much cargo is waiting - like "General Goods", "Steel", "Containers", all under "Processed..." or a lot of other ones, too. I really like this behaviour, however, my problem is that i usually try to provide a perfect service at all of my stations, to gain a station rating of min. 80%. This means that there is always a train waiting at the station, and no cargo is waiting. This leads to all of these nice stations to be empty - of course that is wanted to show that there is no cargo waiting, but it is also sad, as one could build much more beautiful stations if there would be cargo on those tiles.
So, my suggestion would be to show a little little bit of the corresponding cargo on those tiles, even if none is waiting to be picked up. For example, at wood-platforms or tiles there could only be one stem which might have been forgotten, or on coal tiles only a tiny bit of coal or one good crate or so.... I hope you get what i mean
Tell me what you think.. And keep up the good work, please!!