28.In the railroads' prime years，between 1 890 and 1920，there were a few individuals in the United States，most of them with solid railroading experience behind them，who made a profession of writing about railroading--works offering the ambience of stations，yards，and locomotive cabs.
(同位语most of them;定语从句who made a profession of writing)
在1890年到1920年间铁路的黄金时期，美国有几个人(他们大多有丰富的铁路经验)以写铁路题材为职业——作品围绕车站、停车场和机车。
分句1. there were a few individuals in the United States
分句2. most of them with solid railroading experience behind them
分句3. who made a profession of writing about railroading
分句4. works offering the ambience of stations，yards，and locomotive cabs.
1是主句
2和3是嵌套
2作为1中a few individuals 的同位语，对它进一步解释说明
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