@RSJB18 posted:I put the car on the layout last night and tested it out. Pushing the car with my 0-4-0 through a 027 curve was lifting the truck off the track a bit. I weighed the car with the load at 8oz. The load weighs 1oz, and I added another 2.5oz. to the load.
Bob
And yes- that old scale is accurate within .25 oz.
You probably already know about NMRA recommended practice for car weight, but just in case... for O scale, it's 5 ounces + 1 ounce per inch of length. So a 9 to 10-inch gondola should have a total weight of 14-15 ounces. Although it's technically still underweight, there's no value in making it any heavier than it needs to be in order to stay on the track. Can get tricky with O27 curves - gotta be strategic regarding where it fits into a train.