Enlarge mines and build extensive railroad network for them

Enlarge mines and build extensive railroad network for them is an upgrade in Cossacks 3, available at the Mine.

Background
Increasing the size of the mine and developing the infrastructure that services it allows for greater numbers of miners to work in it.

Effect

 * Each upgrade increases mine capacity, by 5, 8, 10, 12, 15, and finally 40 slots, for a grand total of 95 miners.