Intermodal starting / ending on rail

Quite by accident, I stumbled across https://www.youtube.com/watch?v=i2QIlsms0t4&t=48s which shows a curtain wall container being loaded while on a rail car.

Are there similar instances of Intermodal traffic in north america starting or ending on rail? (I'm guessing the wide spread adoption of double stack well cars means that if there are, they are in the past.)

For a while in the 1960's FlexiVans were loaded with mail while on TTX cars at the mail platforms of Chicago Union Station, presumably handled at standard intermodal terminals at destination. Some had PRR keystones -- the only ones I know of that had such. (Maybe someone on here knows more about that.) I think the practice was otherwise unknown in the US.

According to the PRR group on Groups.io, the Pennsy leased 50 MDT Mark IV Flexi-van flatcars and purchased a group of 100 containers in 1967 for mail service. That was the only PRR flexivan equipment.

Thanks; I've often wondered about that -- and I worked for the PRR.