Core Viewpoint - The opening of the Xi'an to Yan'an high-speed railway significantly reduces travel time from 2.5 hours to approximately 1 hour, highlighting its unique geographical and urban importance along the route [1]. Group 1: Travel Time Differences - The fastest train from Xi'an North to Yan'an takes 68 minutes, while the slowest takes 103 minutes, resulting in a 35-minute difference due to varying stop strategies rather than speed differences [2][3]. - Different train services cater to diverse passenger needs, with faster trains stopping at fewer key stations and slower trains accommodating more regional stops [6]. Group 2: Infrastructure Development - The construction of the largest high-speed railway station in Western China, "Xi'an East Station," is progressing, which is expected to further reduce travel time once integrated with the Xi'an to Yan'an high-speed railway [5]. Group 3: Train Classification - The Xi'an to Yan'an high-speed railway operates with "C" prefix trains, classified as intercity EMUs, which serve high-frequency travel between adjacent cities [7][16]. - The "C" trains, while categorized as intercity, utilize high-speed technology, and future adjustments may introduce "G" and "D" prefix trains for enhanced service [18]. Group 4: Continued Service of Conventional Trains - Despite the introduction of high-speed services, conventional "green trains" will continue to operate, providing economical travel options for passengers [20]. - The railway department plans to optimize the operation of both high-speed and conventional trains to meet diverse travel needs effectively [22].