What does the cryptic crossword clue "Advertisement by railway that has many layers? (4,6)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Advertisement by railway that has many layers? (4,6)

Times Cryptic #28755 | 14 Down | 2023-11-08 flower

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