Thomas,
Your 263E Engine & 12 Wheel Tender, both the original Lionel and the MTH Repro were engineered to pull 800 series type rolling stock including the big 810 Crane Car, the 2600 rolling stock was sold with the mid sized 249E and the smaller 259E. Also remember the Pre War rolling stock & engines/tenders came with both Black Auto Couplers and Latch type Couplers, depending on which set you purchased. The 3651 log dump Car, which I happen to have also, will pull behind either the mid size 259E or the smaller 259E engines and tenders, with the proper matching couplers. The original Lionel 226E came with the 226W Die Cast 12 Wheel Tender and 2800 rolling stock.
Hope this helped you a might.
PCRR/Dave
