New In Box The MTH 20-2239-1 B&O FA-2 ABA Diesel Engine Set is a highly detailed model for model train enthusiasts. Made by MTH, this set includes three different ABA diesel engines: #833A, #833X, and #835A. Suitable for ages 17 and up, this set is ideal for collectors and hobbyists looking to expand their train layout with authentic Baltimore & Ohio locomotives. The included PS2 couplers add to the realism and functionality of this new-in-box set.