Which improvements cost $?

Roads -> 1gpt
Railroads -> 2gpt
The word 'improvements' is misleading. It only means roads & railroads.
 
Note that workers olso cost maintanance

True, but I'm pretty sure workers are listed as "unit maintenance". The OP was probably wondering what was counting towards his "improvement maintenance" costs. As previously states, it's just roads and railroads.
 
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