The Ladies' Book of Etiquette, and Manual of Politeness

There are many little civilities which a true gentleman will offer to a lady traveling alone, which she may accept, even from an entire stranger, with perfect propriety; but, while careful to thank him courteously, whether you accept or decline his attentions, avoid any advance towards acquaintanceship. If he sits near you and seems disposed to be impertinent, or obtrusive in his attentions or conversation, lower your veil and turn from him, either looking from the window or reading. A dignified, modest reserve is the surest way to repel impertinence. If you find yourself, during your journey, in any awkward or embarrassing situation, you may, without impropriety, request the assistance of a gentleman, even a stranger, and he will, probably, perform the service requested, receive your thanks, and then relieve you of his presence. Never, upon any account, or under any provocation, return rudeness by rudeness. Nothing will rebuke incivility in another so surely as perfect courtesy in your own manner. Many will be shamed into apology, who would annoy you for hours, if you encouraged them by acts of rudeness on your own part. In traveling alone, choose, if possible, a seat next to another lady, or near an elderly gentleman. If your neighbor seems disposed to shorten the time by conversing, do not be too hasty in checking him. Such acquaintances end with the journey, and a lady can always so deport herself that she may beguile the time pleasantly, without, in the least, compromising her dignity. Any slight attention, or an apology made for crushing or incommoding you, is best acknowledged by a courteous bow, in silence.