1. The usual minimum is a pole mounted flag with suitable name/symbol.
2. Modern stops are mere steel and glass/perspex constructions, although in other places, such as rural Britain, stops may be wooden brick or concrete built.
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How do you read "/" in each sentence?
1. name or symbol
2. name, symbol
3. glass or perspex
4. glass, perspex
I try not to put / in sentences because it's not a word. It can mean "or" or it can mean "and." It all depends on context.
So I think any of your pronunciation answers can be considered correct.