Been experimenting with terrain colors and I think I've come up with some good ones. Try these out. The values are R, G, and B.

0ft, 42,82,100
0ft, 126,62,73
2500ft, 141,165,120
5000ft, 255,200,113
7500ft, 204,102,51
10,000ft, white.

There are two 0ft colors for a reason. Just make sure they're in that order. It'll give you a better looking coastline.

For the tracks try this.

-2000ft/min, Black
-1000ft/min, Red
0ft/min, White,
1000ft/min, Green
2000ft/min, Black