Is the Delos Westworld park a physical place in the TV show?
There is no doubt that the park is a physical place (although we don't know where it is).
You have to travel to the receiving area in a train (the white high-tech, bullet train version).
The hosts are physical constructs...we see them being made and interacted with in the inner workings of the park and they are put into storage when not being used.
they get to the park by an elevator that leads inside a moving train.
As for the elevator...there is no evidence that the train is moving when they board it. The scene suggests that the carriage is standing still until a certain point when it starts moving...as indicated by the overhead light starting to vibrate.
Then it seems that the 'Western' train simply comes out of a tunnel.