The Baltimore & Ohio Chicago Terminal was a B&O subsidiary that handled switching and transfer chores in its namesake city. In this transparency loaned by Robert Leffingwell we view B&OCT 0-8-0 No. 1703, later 903, performing these duties at Chicago's Grand Central Station, owned by the B&O and used by several other railroads. John Szwajkart's video The Chicago Collection includes several cuts of this locomotive switching the B&O's premier train, the Capitol Limited, in 1955. Class L-3, to which this engine belonged, was originally numbered 794-799 and was again renumbered to 900-904 before retirement. The B&O rebuilt many Class E Consolidations into 0-8-0 switchers and the L-3 class may have originated in this way, but I have not come across exact information about No. 1703's origin or dimensions.