What I've always hated in Civ and SMAC is the infinitely fast trains. Movement on RR ought to take 1/12 x unit speed movement points; or some such formula. Thus every unit moves the same speed by train, but still faster than on a road.
This would make airports more useful and encourage straight routes. Civ2 got especially crazy with my railroads meandering through the hills. And I really hated it that my infantry got to the front faster than my planes. So planes are infinitely fast now too, but that's a different issue.
Also Civ2 reduced the effect of RR so that the whole map wouldn't be covered with them. I liked that. Now we're back to Civ1 style but expanded so you build roads everywhere too.
This would make airports more useful and encourage straight routes. Civ2 got especially crazy with my railroads meandering through the hills. And I really hated it that my infantry got to the front faster than my planes. So planes are infinitely fast now too, but that's a different issue.
Also Civ2 reduced the effect of RR so that the whole map wouldn't be covered with them. I liked that. Now we're back to Civ1 style but expanded so you build roads everywhere too.