I purchased two MTH two rail Jersey Central Camel Backs #774 & #779. Just noticed that MTH put different tender trucks under the two loco's. Number 779 is still available in two rail from MTH.
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Now isn't that odd. Which truck style is correct?
Looks like they followed the prototype to me. Here is 774 with trucks like the MTH 774:
http://www.rr-fallenflags.org/cnj/cnj-s774.jpg
The prototype 779 appears to have different trucks
http://www.rr-fallenflags.org/cnj/cnj-s779afm.jpg
which are like the ones on 784
http://www.rr-fallenflags.org/cnj/cnj-s784jda.jpg
I love the train lighting generator and the pilot on the tender. Yes I think MTH did there homework.
Good for MTH 
Caboose and tender trucks seem to be the ones that are most difficult to get right, although I have a few out-of-box pieces of rolling stock that need friction bearing trucks vice roller bearing.
