The ATLAS O 30138213 Union Pacific SD70MAC RD No. 4015 Big Boy Escort with Protosound 3 is a highly detailed model of a diesel locomotive. This limited edition replica features a three-rail system, digital control system, and ABS body with a metal chassis and diecast trucks. With vibrant yellow and gray colors and realistic light functions, this collectible item is perfect for model railroad enthusiasts of all ages. Made by Atlas, this locomotive is a must-have for fans of transportation and railroads, offering a unique and engaging addition to any collection.