Rail Name Letter U from BigJigs. Compatible with BigJigs Rail and other leading wooden train sets. Each carriage is L 70mm x H 60mm dimension, comes individually boxed and is available in red, yellow, green or blue. We carry a full range of these wooden train lette. Please feel free to request particular colours for your wooden letters in the comments box. We will oblige subject to availability but cannot guarantee that the requested colours will always be available.