on a siding
铁路术语，指侧线或旁轨。
The freight cars were left on a siding.
货车被留在了侧线上。
侧线；岔线
一段较短的侧向轨道,通过道岔与正线相连,用于装卸货物、停放车辆或供列车交会或超越；旁轨；边宽
A short section of track beside a main railroad line, connected by switches, used for storing trains or loading and unloading freight.
一段较短的侧向轨道,通过道岔与正线相连,用于装卸货物、停放车辆或供列车交会或超越
A second, relatively short length of track just to the side of a railroad track, joined to the main track by switches at one or both ends, used either for loading or unloading freight, storing trains or other rail vehicles; or to allow two trains on a same track to meet (opposite directions) or pass (same direction) (the latter sense is probably an American definition).
The house has new vinyl siding that looks like wood.
这栋房子安装了新的乙烯基壁板，外观像木头。
用法提示：siding作为不可数名词，指房屋外墙的覆盖材料（壁板）。
We need to replace the damaged siding on the west wall.
我们需要更换西墙上损坏的壁板。
用法提示：siding在句中表示具体的外墙板材。
They installed metal siding to protect the barn from the weather.
他们安装了金属壁板以保护谷仓免受天气影响。
用法提示：siding作为建筑材料，强调其防护功能。
铁路术语，指侧线或旁轨。
The freight cars were left on a siding.
货车被留在了侧线上。
建筑术语，指外墙护墙板。
They are installing new siding on the house.
他们正在给房子安装新的护墙板。
描述护墙板的材料。
The house has vinyl siding.
这栋房子有乙烯基护墙板。
与 siding 基本可互换，但更强调轨道的位置，而 siding 更强调其停放、装卸的用途。
强调两端都与正线相接成环状；若是尽头式侧线（只有一端接正线），不能用 loop。
专指供会让用的侧线，功能单一；siding 还可用作货物装卸或存放车辆，passing loop 仅强调交会。
grammar · medium
易错句子I am siding with you on this issue.
正确表达I am on your side on this issue.
误用 'siding' 作为动词，其名词意为‘侧线’或‘护墙板’，无动词用法。应使用状态短语 'be on someone's side' 表示支持。
grammar · medium
易错句子The siding of the road is covered with snow.
正确表达The side of the road is covered with snow.
混淆 'siding'（铁路侧线或建筑外墙材料）与 'side'（侧面、边）。指道路边缘时应用 'side'。
siding 此处指铁路侧线，由道岔与正线相连，用于会让、越行或装卸；其相对概念为正线或干线。
siding 指铁路侧线或建筑外墙板；sideline 指副业或场边线，二者含义不同，但拼写和读音相近容易混淆。
siding 是名词，指侧线或壁板；side 是名词或形容词，指侧面或一边，二者词性不同，但字形和词源相关。
铁路侧线
The freight train was moved to a railroad siding.
货运列车被转移到铁路侧线。
在侧线上
The empty cars sat on a siding all night.
空车厢整夜停在侧线上。
驶入侧线
The local train pulled into a siding to let the express pass.
这趟慢车驶入侧线，让快车先通过。
修建侧线
The company plans to build a siding to serve the new warehouse.
公司计划修建一条侧线，连接新仓库。
侧线道岔
The engineer lined the siding switch to move the cars off the main track.
司机扳好侧线道岔，把车厢移出正线。
side
side + walk
side + line
side + ways
along + side
a- + side
side (边，侧) + -ing (名词后缀)
基础词，无词缀
side (边) + line (线)
side (边) + track (轨道)
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.