Merge pull request #7 from dkouzoup/additional_small_fixes

appropriately import train

fix id of intercity train

Merge pull request #6 from zanellia/main

revert file name, adapt calls accordingly

fix train file name

Merge pull request #3 from dkouzoup/json-train

added todo for dynamic efficiency in json

added rolling resistance coef units in comment

reverted changes in checkFields

renamed track and fixed typo in pdf filename (fig9)

fixed simulations

removed old train data

importing train specs from json

extended convertUnit and moved to utils