Rails Joy Midi Dress in Black. - size M (also in S) Rails Joy Midi Dress in Black. - size M (also in S) Viscose blend. Partially lined. Pull-on styling. Smocked waist. Front keyhole with tie closure. Ruffle hem. RAIL-WD140. 923-111-1616. Launched in 2006, Rails is a unique brand of fashion fusing California comfort activewear with European styling. High quality fabrics, narrow cuts, and unique lines; this collection is influenced by international travel and metropolitan lifestyle.