"Private varnish", that is, privately owned train cars, are at the top of Beebe's list - are there any left running, do you suppose? With several maid's bells and gold-plated plumbing? (An investment in efficiency - "saves polishing".)
Interesting detail of between-the-wars travel, when money could not be
pulled out of an ATM, or even most banks:
In a day before American Express credit cards and traveler's checks,
a letter of credit was a formidable document issued by one's home bank in
the amount of a sum sequestered against it in Boston, New York, or
Cleveland. This bedsheet-sized document handsomely engrossed and sealed was
presented at the bank's European correspondents... who advanced what the
traveler might need in pounds or francs and wrote the amount on the back of
the letter of credit. It was the only known way of financing
travel. ... The opening move was to dispatch either by hand or through
the post a letter to, say, Baring Brothers' main office in the city
acquainting the management with one's identity, references, family and
financial background, and warning of one's impending arrival with the
intention of drawing against a letter issued by the Old Colony Trust of
Boston, It was wise to suggest a date for the rendezvous at least four or
five days in the future... On the appointed morning the party of the
first part arrayed himself as for a garden party at Buckingham Palace,
braided-edge morning tail coat, black silk hat, umbrella, and wash gloves.
... It would take until the afternoon to secure the currency from the
vaults, count it, and record the serial numbers of banknotes. First there
would be lunch at the Travellers' Club....Colchester oysters, Melton
Mowbray pie, a cold lobster, Stilton cheese, claret, Port, and cigars
followed in the ritual of the busnessman's luncheon, after which a state
progress in reverse to the bank was in order.