siding

noun
1
a short track next to a main railway line, where trains can stand when they are not being used
خط فرعی, ریل فرعی, ریل فرعی راه‌آهن
2
material used to cover and protect the outside walls of buildings
پوشش دیوار خارجی, روکش ساختمانی, دیوارپوش
aluminium siding