Wooden Rail Name Letter R from BigJigs. The BigJigs wooden alphabet train carriages are gorgeous and fully compatible with BigJigs Rail and other leading wooden train sets. Each carriage is L 7cm x H 6cm in dimension, individually boxed. Available in red, yellow, green or blue. We carry a full range of these wooden train letters and stock the entire alphabet. 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.