Having railroads impact military unit movement and industry/commerce would be nice.
Maybe a bonus yield of hammers and/or gold to the city center if connected by rail to a city with a harbor? And +3 (or so) movement to military units?
At some point it would be neat if they could implement some sort of 'supply' cost to military units, so supply trains would become a necessity. Like, say, units in addition to a health bar also have a movement bar, and a supply wagon needs to 'tag' them to refresh their movement points, or they can 'heal' movement points by standing on a railroad or in a city, or pillaging of course.
Maybe a bonus yield of hammers and/or gold to the city center if connected by rail to a city with a harbor? And +3 (or so) movement to military units?
At some point it would be neat if they could implement some sort of 'supply' cost to military units, so supply trains would become a necessity. Like, say, units in addition to a health bar also have a movement bar, and a supply wagon needs to 'tag' them to refresh their movement points, or they can 'heal' movement points by standing on a railroad or in a city, or pillaging of course.