Looking for the name of a girder bridge carrying car from Lionel.

Thanks for the link below on the post titled "A site with Lionel train O gauge listing of the cars with descriptions? " I have been able to
track down all my model train cars and accessories except one. Does anyone know the number, name or a link too information about the car. It carried two orange plastic bride sides similar to the sides of 314 Girder Bridge 1945 - 1950. I believe I got the car new between 1959 to 1961 it was very long I think had a gray flat bed that was heavy steel. It had four trucks two at each end. I think two axles per truck or maybe it was three. So it had a minimum of 16 wheels. The bridge sections were held on by a wrapped rubber band (pony tale hair tie).
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----------------------------------------------------------------------------------------------------- Perhaps this is the car:
"6418 Machinery Car... 1955 through 1957. Model of a 150-ton-capacity depressed center car made by the Pennsy. Die-cast frame painted light gray, with four sets of standard metal trucks. *** Came with two orange plastic girders and two elastic guy lines. In 1955 the girders said "Lionel" in raised letters, which were the same color as the girder. In 1956 and 1957 the girders were a lighter orange, almost pink, and the lettering said "U.S. Steel" in black. Some girders in 1957 were black ***. The car girders had 6418 in raised, white numerals. The bridge girders did not." (Source: "Lionel A Collector's Guide and History", Volume II: Postwar, McComas and Tuohy).
Bill Bill's Railroad Empire N Scale Model Railroad: http://www.billsrailroad.net Brief History of N Scale: http://www.billsrailroad.net/history/n-scale Model Railroad Books, Toys, and Trains: http://www.billsrailroad.net/bookstore Resources--Links to 1,200 sites: http://www.billsrailroad.net/bills-favorite-links
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This car is the No. 6418 "Machinery Car" or "Girder Bridge Car". It is a die-cast, depressed center gray painted flat car supported by span bolsters with two four-wheel trucks on each. The car was cataloged from 1955 through 1957. The 6418 came with 3 variations in the load - orange girders marked "Lionel", orange girders marked "US Steel", or black girders marked "US Steel". The same 16 wheel flat car came with a large transformer as the load in 1956 - 58 as No. 6518. Geezer
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You can see 'em on eBay:
http://search.ebay.com/lionel-6418_W0QQfromZR40
Bill Bill's Railroad Empire N Scale Model Railroad: http://www.billsrailroad.net Brief History of N Scale: http://www.billsrailroad.net/history/n-scale Model Railroad Books, Toys, and Trains: http://www.billsrailroad.net/bookstore Resources--Links to 1,200 sites: http://www.billsrailroad.net/bills-favorite-links
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