A US train set would be nice, now they have some awsome Diesels an a few electric, but in the past a lot af astonishing steamengines thundered across the continent, European engines from the same period look like bugs compared to these machines.Ill give some examples:
Pennsylvania K4s 4-6-2 (wheel alignment)
Southern Pacific Lines Serie 4151-4176 "cab ahead" 4-8-8-2
Famous the Milwaukee Road Hiawatha streamline 4-6-4
My favorite the New York Central 20th Century Ltd (1938) 4-6-4
Pennsylvania engine nr 6100 6-4-4-6
And last not least the ultimat fright engine developing 10000Hp the Union Pacific Big Boy mallet 4-8-8-4.
There were more intresting designs, but cant mention them all. If foto's are requiered i have.
Looking forward to the development of a US train set
EDIT: for some reason i can't upload a nice image i have of one of these machines, will try later again (png format)