This just arrived in the mail today.
Set 1378 RCT - Ambassador set from either 1934 or 1935 (as the numbers were the same in both years). I suspect my set is from 1934 as it uses the pre-streamliner label and has a Century of Progress set number sticker on it.
Now all I have to do is dig out the appropriate engine to go with the set. I know I have one in a box somewhere.
NWL