If something is transferable, it can be passed or moved from one person or organization to another and used by them. Your Railcard is not transferable to anyone else
A letter of credit that allows the beneficiary to transfer in whole or in part to another beneficiary any amount which, in aggregate, of such transfers does not exceed the amount of the credit Used by middlemen
Negotiable, as a note, bill of exchange, or other evidence of property, that may be conveyed from one person to another by indorsement or other writing; capable of being transferred with no loss of value; as, the stocks of most public companies are transferable; some tickets are not transferable