All aboard for fun! Your buddinglittle conductor is on track for chugga-chugga good times with the Rollplay?4-Piece Straight Track expansion pack. Four track sections workexclusively with your Rollplay Steam Train 6V BatteryRide-On Vehicle(7221 and 7721) set to extend your indoor railway anadditional 4 ft. ― the more track sections you add, the farther you can go!These straight track pieces snap together in seconds with the 24 ft. oval or 13ft. circle that came with your Rollplay Steam Train set. For maximum indoorthrills, combine straight tracks with Four-Packs of Curved Tracks (soldseparately) to create different lengths and shapes for your train to run on.Wind around the room, down the hallway, around the table ― the possibilitiesare endless. Get your imagination rolling!?