Don't know about tractive effort (though it had enough to tear up track when misused as a helper) but for length... PRR's BP-1 officially consisted of two Baldwin DR-12-8-3000 "Centipedes" drawbar-connected for a 2-D+D-2+2-D+D-2 configuration. Whole set had the same road number and everything. 91 1/2-ft long ... doubled.
Hmmm... just looked it up and tractive effort was a mere 102,500... but that's for half the official locomotive, so 205,000 the set.
And (though there isn't one for Trainz...yet) mustn't forget Virginian's EL-2Bs - 2(B-B+B-B) - at 260,000 tractive effort the set. They also had one road number per set, but it might be considered cheating to take power from the overhead. Any rules to this competition?
