source: The Republican (Danville, Indiana) - issue of Thursday, August 18, 1960 - page 1, column 1:
According to a newspaper article, in August 1960, the New York Central Railroad announced they were naming their new freight yard in Avon as "The Big Four Yard." The name was a tribute to the Cleveland, Cincinnati, Chicago and St. Louis Railway Co. (known as "The Big Four"), which had provided train service throughout Indiana, Ohio and Illinois since the 1800's. On February 1, 1930, The Big Four had been absorbed by the New York Central Railroad.
The new freight yard in Avon was to be formally opened on September 15, 1960.