Hi,
I checked those dates and I see what you mean....the CALEDONIA left Glasgow 26th Sept 1930 and arrived New York 5th Oct 1930, then they came to Glasgow again, arriving 1st Dec 1930 on TRANSYLVANIA. ...I looked at the ships passenger lists again and the dates are right, so this means there must have been another voyage back to New York.

I don't see it after a quick search, but I will look again.

Brian