In the 1940's we lived on Marble Hill, Manhattan. We were used to seeing important trains at their scheduled times of the day, almost always westbound some minutes after their scheduled departure from Grand Central. I don't know why we didn't hang around for eastbounds. On one odd occasion, maybe 1948, a streamliner of unusual cars passed westbound, and I was told it was the Mercury to Toledo. In old references on this board, I cannot find a Mercury from GCT. Can anyone guess what I may have seen? Many thanks.