@Jeff Green posted:So PS2's will start any length or weight of train unless they actually can spin their wheels from the weight. PS3 will not start a long heavy train no matter how many PS3 engines you have on the headend because they all will "stall".
I'm not sure where you get your information, but it's certainly not correct. There is nothing about the PS/3 electronics or operation that precludes it from starting and pulling just as well as a PS/2 locomotive.
I just performed a little test. I have the MTH 20-20385-1 UP AC4400CW diesel sitting in my yard, so I pulled it out and put my scale on the coupler. It was able to immediately start pulling from a dead stop and apply 35oz of drawbar force, a respectable amount.
I then tried the same test with the PS/2 MTH 20-20141-1 SD70ACe diesel and got a drawbar force of 32oz, pretty similar.