Comet, the fastest reindeer around, is hauling some special Christmas deliveries via the rails on this festive freight train SCALE AND GAUGE DETAILS: 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. PRODUCT OVERVIEW: Lionel The Comet Christmas Freight Bluetooth Electric HO Gauge Model Train Set with Remote will be a great addition to any HO Gauge layout. These are small enough to build a gratifying layout in an efficient space and are large enough to illustrate all the details.