Some scenarios writers classify their scenarios level according to the to headache they provide to users find markers and/or find what to do (just say: follow task list - F1). It's an option, or a style, or a matter of courtesy, I respect all...
Since 2001 with MSTS I'm an engineer trainsimer, so my scenarios are engineer focused with means you will have a conductor aboard taking care of route, destinations, duties, signals, speeds etc. As driver you will be focused on your prime functions: accelarate, de-accelarate and stop the consist safely. Player even don't need to use any external view, neither map view, nor F4 (unless he don't have Raildriver or don't like to play with keyboard). F3 is forbiden since each scenario has up to 10 random versions varying signal aspects and minor events (like stop or not stop at certain place), as suprising factors to re-run a scenario instead repeat the same till master it (I usually play 1 or 2 times to understand instructions, and more 1-2 times untill I get about 100% on both scores at the end of scenario).
Trainz have the best windows instructions screens system: one retangular and small on the top of screen for main instructions, and one small in the bottom to secondary and fast messages/warnings. And more: both don't block driver vision of track and are time controlled: you can display say 2-3 secs for a short message like: easy (when almost coupling), go ahead, move forward, hold, wait, proceed etc.
I've already suggested (i.e., e-mailed to support) something similiar to RSC but they came with a instruction screen even larger (and jumping in the game screen) holding a totally unusefull pic of crew outside... As driver I can't understand, sincerely
If the task is exclusively at a certain yard, you can display in the first message an advice to driver go to Map View and study the area before proceed, and so on... In RW is missing a tool to print track plans, otherwise scenario writer could provide a small printable map with the scenario pack.

Who doesn't have dog, hunts with cat.