At the moment the big rail depot at Cologne is unused, this did suprised me as on other routes with rail yards most of the time they are usuable and have services moving trains/locos in and out of them. I had a quick glance on Google maps and I could, what i think is, see the ICE3, BR 101 with the intercity coaches and a small shunter. Given that these or similar locos are in the game it would be great if these could be utilised and for the just base route you could have a few shunting services with the ICE3.