Marty, the dash 8's feel like the weight of my usa's. I want to be more exact for you so I threw one on the bathroom scale, roughly 10 lbs but the scale's not that accurate. They pull really well. I don't have a good test hill. They will each pull the cars I have up to speed no problem.
They (all of the mth G scale) comes ready to mount Kadee's right to the body. I'll be detailing more and weathering my dash 8s and my challenger soon. I have to practice more on something less critical. I'm looking at rusting techniques in this month's O Scale Trains article. Joe