6″ Traction Engine Part 2 By davek0974 | 27/05/2008 - 8:26 pm |15/12/2015 6" Traction Engine Boiler The boiler on its delivery pallet, around 250kg of boiler steel! There is a 12″ rule on top for scale. Bearing bracket Rear axle tube Crankshaft bearing Mandrel and bearing brass As this build was now being sold as a buy-per-chapter book, the web log here was stopped, sorry. The book is still on sale in my shop. Bookmark the permalink.