Lionel celebrates an extraordinary 125th anniversary signifying a true passion for model trains that continue to create memories that will last a lifetime. Compatible with Lionel HO Gauge Systems, is weighted for reliable operation and features metal wheels, metal knuckle couplers, and opening side doors. Lionel HO Gauge are 1:87 in scale, are half the size of the traditional O Gauge and have become the most popular model railroad scale in the world today. These are small enough to build a gratifying layout in an efficient space and are large enough to illustrate all the great details. HO Gauge products operate on a 2-Rail HO FasTrack System that has a fantastic exemplary look and features a quick easy snap-together connection. Recommended for age 14 years and up.