I am too old to have ever watched Sesame Street, but I take your word for it!
Mr. Google is your friend
OK, so time tunnel test..
Trapdoor
Ivor the Engine..
Pitkins..
Bagpuss..
Capt Pugwash..
Mary Mungo and Midge?
Muffin the Mule (can't believe they got away with that)
Andy Pandy
The herbs..
Etcetra Etcetra