Just tested an PRR 5S A1A2 Baldwin DR-12-1500/2 (Centipede) Lionel 6-34672 (2013-1 Catalog) which I received last week. Took a while before I realized you need to program the engines together and not separate. They don't tell you this until page 10 of the instruction manual. The A2 unit has loud Diesel sounds, but no crew talk or bell. Plus the horn in the A2 unit is very weak by itself. Programed together, you do not notice what the A2 unit (#5821) lacks. Weight for each unit is 9.75LBS, 19.5LBS for the A1A2 consist, with all eight inner axles powered and the two outer axels on each C truck with traction tires. Total tractive effort for both units is 3LBS 14OZ. By way of comparison, an AAAA 3rd rail EMD E8 consist weights 21LBS with 6LBS 6OZ tractive effort. I find the Lionel Centipede models far more attractive and powerful looking in real life than in photos. Strangely, just like the Real Locos, they look far more powerful than they actually are!!!