The bus - a 1946 GM Model TD-4506 and one of twenty-five numbered from 1700 to 1724 was delivered to Chicago based Omnibus Corporation affiliate Madison Avenue Coach Company, Inc. (MACCO) of Manhattan, New York only weeks before the shot was taken.
While the upholstery is Velour (get's pretty sticky in the summer months!), the rest of the interior trim still shows signs of material shortages immediately after the war in the form of painted steel passenger hand rails, standee straps and seat backs in place of stainless steel.
One curiosity is the strange vent in the aisle floor amidships - I don't remember that feature on Green Line's (NY) 4506's.
Photo courtesy of the New York Bureau of the Chicago Tribune and is up for sale as 'Buy It Now' on eBay through tribunephotos as item # 251088597921.
Mr. Linsky - Green Bus Lines, Inc., Jamaica, New York