One of Contractor's 'Centre Plows' for Unloading Trains, c. 1882
BCA Call Number: I-30861
BCA Catalogue Number: ON5-27
BCA Accession Number: 198401-006
Photo in Onderdonk Album, #5, 27.

Some flat cars were slightly modified to facilitate ballasting operations, with 'side plow' and 'centre plow' machinery that enabled the quick unloading of ballast on the side of the track. A brief description is given in the pages of The Inland Sentinel.