根据美国联合通讯社转载美国新闻与世界报道的一篇文章，位于美国新墨西哥州卡尔斯巴德的卡尔斯巴德洞窟国家公园，其园内的基础电梯系统在三月安装了新的发动机，使其维护和现代化更新达到了一个新的里程碑。该电梯系统自1955年安装，于2015年11月由于一条6英寸的发动机电缆断裂而关闭。此次维护和现代化更新的工程在2017年12月开始，新的发动机由一台大型起重机安装好，总7300磅，提升能力为4000磅。公园工作人员称下一步将安装新的导轨。

　　CARLSBAD REPAIR, MODERNIZATION REACHES MILESTONE

　　The repair and modernization of the primary elevator system at Carlsbad Caverns National Park in Carlsbad, New Mexico, reached a milestone in March, when the new motors were installed, U.S. News and World Report said in an article, citing the Associated Press. The system, installed in 1955, was shut down in November 2015 when a 6-in. motor shaft sheared off. The repair and modernization began in December 2017. The motors, installed with the use of a large crane, weigh 7,300 lb. and have a lift capacity of 4,000 lb. A park official said the next step will be to install new guide rails.