Self Propelled Eggliner Rail Car – Halloween – O Gauge. Bachmann Eggliners are colorful egg-shaped vehicles designed to zip around your O Gauge Layout. These self-propelled railcars are a great way to celebrate the seasons on your model railroad. Featuring operating headlights, marker lights, drawbar coupler for consisting multiple Eggliners together, and transformer-controlled forward, neutral, and reverse operation, their vibrant colors and fun design are sure to liven up your layout.