Trainworx 45385-05 N Scale 53′ Semi Trailer YELLOW 530123 In the Trainworx N scale line, the 53′ semi trailer is one of their most popular modern highway models, designed to match real-world North American dry van trailers used from the late 1990s to today. Trainworx is known for their details and prototypical accuracy. NOTE: Road number may vary from picture shown.