A Trio of Cattle Trucks! A Trio of Cattle Trucks! Great Western Railway 18' 6" Diag W1 Cattle Trucks Built using Slater's Plastikard 7mm kits. Great Western Railway Small cattle Truck Diag W3 Constructed from a Pow Sides models etched brass kit wenlock in A Trio of Cattle Trucks! June 16, 2012 16