Barry's Big Trains drives This page will be updated with more data and pictures Additional weights: The weight in the back is 2" long x 1-3/8 wide by 1-5/8 tall, and has a hole in it for the existing stud, and you have to counterbore it a bit because there is a bit of a reinforcing ring at the base of the stud. The weight in the front is 3" long x 1-1/2" tall, and 1-3/8" wide, about 1-1/4 there is a 5/16" hole to fit over the stud, and there is a recess in the bottom that is 1" long and 1/4" deep to clear the valve gear. This is for the vertical motor. The older setup with the horizontal motor takes a different weight. (pictures courtesy Dave Goodson) from Barry's instructions for the BBT 2-8-0 drive LOCOMOTIVE WEIGHT The BBT DRIVE 280 requires the addition of a weight of about three to five pounds to provide adequate traction for the new power. I had intended to provide these weights as an extra- cost item, but the availability and price of lead and the cost of shipping have ruled this out. Therefore, please consider the following drawings to cast your own weight. The mold is made up of 2 x 2 boards on a plywood or particle board base. The actual dimensions of a 2 x 2 are 1 5/8" thick by 1 5/8" wide. Filled with lead this size will yield a weight of four or four and a quarter pounds (2 kilos). You can produce more than one weight from this mold. Screw the boards down and un-screw them when the lead has cooled, pound out the 3/8" dowels for the posts. In multiple casts, use new posts for each application (although I have been able to reuse these post for a few weights). The wood should be fairly dry, and there will be a bit of smoke, but the end product is just fine (keep some water handy, sprinkle it on if a flame develops). NOTE: Some owners of the BBT DRIVE 460 are running weights up to SIX pounds. No known complaints, yet. More weight seems to provide more traction. We don't know the limit. Just as in prototypical applications the pulling capability decreases rapidly as the percent of incline increases. Your old cast-iron weight can be attached to the top of this weight, if it doesn't interfere with the boiler top.