Why Chemin de Fer?

Why is there a version of Baccarat called Chemin de Fer?  How should I know?

The game was developed in France and Chemin de Fer means the railroad or steel road to be more specific.  But why railroad I dont know.  Wikipedia has a good explanantion of the history of baccarat. But it doesn’t say why it is called railroad.

Its a good question, I’ll try and find out.