Old Photo back in the early 80,s of a new interlocking or in railway slang (Diamond) being lowered with a 40 Ohio Crane into position to be bolted up .Interlocking is where two railways intersect,,the (diamond is seen in between the 4 points of the cable sling)..I,d say this 12 ton interlocking is the biggest (Diamond ) being pic, d up in Canada ..Ah