I can not get in N scale:
A nineteenth century ten wheeler
A B&O P-3, P-4, P-7, P1d or Q-4
A P&LE A2a, K-5b or K-6
A 'modern' high drivered ten wheeler
A real 2-6-2 (the Bachpersonn 'prairie' is a USRA 0-6-0 with idler trucks added)
A non shrouded 4-4-2
Any 4-8-0
An AGEIR box cab
A Baldwin road switcher
A Lima yard switcher
A US prototype heavy interurban
I still like N scale, though.