"American European Express" Sign at CUS

Hey all and happy Thanksgiving,

I was at Chicago's Union Station recently in the Great Hall and noticed a sign that said "American European Express" above a set of double doors near the elevator up to Canal Street. Anyone know the significance of the sign and what the room is used for?

Was used for Private for Profit Cruise Train service run by the same people that ran the Venice Istanbul European Express in Europe ran for 2 years sometime in the 1990s . Now is used for private railroad car parking I think