分析句子各个用逗号隔开的部分在句中成分，谢谢清楚了有追加高分

Question

To be specific,the number of passengers per year in Tokyo,the most of that in the six cities,is 1927 million, but the system in 1927 with a 155-kilometre route is neither the earliest nor the longest.

Answer 1

To be specific(插入语做独立成分),the number of passengers per year in Tokyo（名词短语作主语，中心词是number）,the most of that in the six cities(名词短语做非限制性定语，补充说明number的地位),is 1927 million（第一个分句的系动词和表语）, but the system in 1927 with a 155-kilometre route is neither the earliest nor the longest（but连接的第二个分句）.