@Nick Chillianis posted:My understanding was that the trouble with the articulated trailer was that they tended to derail when backing up with any appreciable load in back of the tender. Apparently they were fine when pulling in a forward direction.
Fortunately, backing movements tended to happen during low speed switching. I don't recall reading about any major catastrophic wrecks being caused by the articulated trailing trucks.
there were also some excess stresses on the firebox with the design, if memory serves