Where is the ground in Chicago?

[shortliner]

Sorry = it has just dumped my reply = and I really can't be bothered to get involved in an argument about the semantics of modelling - Life is too short and it's a HOBBY for @@@@@ sake - I go on the basis of "Whatever floats your boat!" and Rules One and Two

#1 its my railway
#2 where other opinions differ from my modelled interpretation, see rule#1