Is there a chart anywhere that will compare the capabilities of steam engines? For example, what percentage grade can a 0-6-0 handle compared to a 2-8-8-2 and what is the minimum radius required. Do the manufacturers give this information in the box? And what about plastic versus metal cars? There was a metal HO box car in the hobby shop that weighted a ton. Why???? A fellow was selling some passenger cars on eBay because he didn't have the correct curve radius to accomodate them. It would be heart breaking to build a layout and then find out that your train can't make it from point A to point B, much less point C!