Well my "Centerpiece" is a glass front cabinet, likely at one time that held flat goods (cloth etc) as its only about 5" deep but is 4 ft 9" wide and 5 ft 6" high. My wife and I refinished the cabinet (its antique oak) and added glass shelves inside to hold trains. I keep it on the wall facing my desk in the office and fill it with my most rare trains, some tin toys, and a shelf full of Suitcliff clockwork boats. We got this piece in 1982 while I was on a 1 year special duty in Boston, Massachusetts.
Most of the contents are from the 1920's to the 1930's. It holds Lionel 603/604 passenger cars from 1920-25 , 253 Apple Green Engine and pass cars from 1932-34, a 248 red set and a 248 orange set both from 1928-29, Ives #50 Parlor Car and #52 Baggage from 1930, American Flyer Hummer from 1920, American Flyer 3110 set from 1928-29, and two Dominion Flyer 1106 passenger cars, a Marx 10,000 stream liner from 1930, and several Fandor Cars from Germany plus some other foreign stock that I have managed to find on some European trips.
The large cardboard Lionel sign comes from the Christmas display from what I believe was the last small retail store that carried Lionel trains at Christmas in Waco . The Marx B&0 F3 Diesel F3 set is not that old, roughly 1953, or rare...but it was one of the very first sets that I found when I was starting to collect.
Best Wishes
Don