I think we all have what we consider our "Dream Locomotive."
For me it is the Lionel Dreyfus 221 Locomotive
It was produced in 1946 & '47.
Produced in Two colors: Gray or Black
It had two tenders available
221T & 221W(whistle)
I remember seeing one in a department store
Christmas layout as a kid and was hooked!

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0-6-0 227, this is the smoothest locomotive I have and it really pulls the cars.