Thanks for the feedback chaps.. sorry it's taken me a while to get back to you on this topic (I've been tied up with r/l issues).
I must admit, the era 1 target for passengers is a bit of a tough challenge. With 3 AI opponents, I suspect it may be almost impossible, given the timescale, so as soon as I can, I'll change the target figure to something do-able (you gave a figure of 15 so I'll try that as a start point.)
The map did give me a few headaches.. trying to get the balance between semi-accurate terrain, and putting features such as rivers and so on in without ending up canyons was a real headache. From my own perspective, using DEM data is an interesting way of generating a "real world" map, but finding the balance between challenging terrain and that "realistic" feel is kind of tough.. I tried to exagerate the terrain so that building became much more of an issue, with bridges and spans needed, but something tells me I overdid it slightly.
I know my main issue was having to reach sea level in order to get the water features to show (it would be much easier if water could just be 'painted' on to any given surface regaurdless of the height in a 'sim city' style method, but hey.. no use wishing hehe)
I'll hopefully get round to polishing up the map in the next few weeks and try and resolve some of the more glaring issues.
Meantime, I'm currently plotting out a new map/ scenario. Not giving the game away too much I hope, but we are talking about a very short historical period (3 years) in which the player will be set a monolithic challenge. I'm having to go very carefully on this one as the subject IS a very contentious one due to historical events and the one thing I want to avoid is offending anyone's sensibilities (my own included). For this reason, although the idea is historically based, the scenario itself will be non-historical and use made up places and people.
All I have to do now is find a few spare hurs in which to get to work..
Once again.. thanks hugely for the input..
Narra