The ill-fated UP 80, renumbered to 8080, made from a Alco PA-2 diesel locomotive, a Great Northern GE W-1 electric locomotive and a Centipede tender -- and that's just the running gear and carbodies!
Of Course I Grew Up On The Northeast Corridor Of The 60s and 70s
And for my turbine engine train thrills I was partial to the United Aircraft TurboTrain.
I rode the Canadian National/VIA Rail Canada TurboTrain once between Toronto and Montreal in 1978.
Also the Amtrak TurboTrain from Penn Station to Boston and Boston to Providence RI in 1973(?), the Amtrak RTG Turboliner from Chicago to Battle Creek MI in 1977 and the Amtrak Rohr Turboliner from Grand Central Terminal to Albany NY and back around 1977.