A state commissioner has officially endorsed the Cog Railway’s plan for sleeper and dining rail cars near the summit of Mt. Washington, while some local residents have concerns about environmental impacts. Speaking during a project conceptual before the Coos County Planning Board on Wednesday, Cog owner Wayne Presby said “Lizzie’s Station,” which would consist of 18 railway cars each with a length of 40 feet attached to a platform near the summit, as well as one shuttle coach (planned to be all-electric) from the station to the summit, would be open to all mountaintop visitors and would help reduce congestion on the state-owned summit circle and disperse across a wider area what has been a growing number of summit visitors. The proposal that was first presented at the March 4 Mt. Washington Commission meeting involves shelter, food and beverage coaches, restroom coaches, and sleeper coaches as well as a new fiber optic cable to the summit and a new wastewater line moving sewage off the mountain. The operation that would be wholly within the Cog’s 99-foot right of way would be seasonal, running from mid-May to mid-October.