How to model Working cranes in HO scale Part 2 by Dr. Geoff Bunza Photos by the author More animated cranes for your layout ... In Part 1 I showed you how to build the first two out of four working cranes. This month I will show you how to build the final two mobile crane projects with cranes on caterpillar treads and show how you can put them on your layout using two different control methods: one with • INDEX • TABLE OF CONTENTS