View the weight of the items with the quality. For example, tanks, wagons, and locomotives. They fit 10,000 pieces into a rocket.

View the weight of the items with the quality. For example, tanks, wagons, and locomotives. They fit 10,000 pieces into a rocket. And I don't see that the locomotive's speed has increased in numerical value.

View the weight of the items with the quality. For example, tanks, wagons, and locomotives. They fit 10,000 pieces into a rocket.

According to the Factorio API:

If an item has no recipe to produce it, it'll fall back to the default item weight.

There's a weight property that looks like it will overwrite this, however, I'll have to write code to properly calculate the correct weight, as vanilla items do not have this property set, and instead calculate it internally.

And I don't see that the locomotive's speed has increased in numerical value.

Silly bug in Quality Lib that was causing the speed stat to be overwritten. Fixed in the next update, but that might take a bit as there's a lot I'm working on fixing/changing right now.

Quality Lib 2.1.0 has been released that sidesteps the weight issue by reverting Quality items back to their original counterparts when they leave your inventory. This means that the weight value will show incorrectly in your inventory (for now), but they should still behave normally when moved into rockets.

Based on how the code works, it looks like you'll be able to get around this by CTRL+Click'ing items into rockets or Z-dropping items onto rockets, so an actual fix for Quality items lacking weight will be coming soon.