句子成分分析及单词理解问题

3 句子成分分析及单词理解问题

It was during the same time that the communications revolution speeded up,beginning with transport, the railway, and leading on through the telegraph, the telephone,radio, and motion pictures into the 20th-century world of the motor car and the airplane.

曹老师您好，我对于这个句子不太理解，想向您请教几个问题，希望能得到回答，感谢！

一、这个句子的成分分析，beginning和leading两个现分短语是什么，它们有主语吗？另，如何理解这个句子的逻辑关系呢？

二、这里leading on through是什么含义，查朗文词典没查到。