Yes the 'classic' Triton would have a Bonneville engine in a Norton Featherbed frame, I think that was cartoon character Ogri's bike.
The Trident was a three cylinder 750cc, I think just about the last of the original Triumphs. Here's me on my first Trident just after I bought it in 1972, it cost £750 cash at the time. Sadly I wrote it off in 1975.
Slippery Sam was a production racer version of the Trident and I can't remember what price they were asking at the show, but it was well in excess of a grand which was a lot of money back then.