In article , aemeijers wrote:

(Saw the strangest thing at an estate sale last year. Small house, and
the beam running down the center of the basement looked funny. After a
few minutes, the penny dropped, and I realized it was an upside down
hunk of used railroad track holding the house up.)

Yep, I've seen that before. My parents have a vacation cottage in a small town
in northern Michigan, where the support beams in the basement are reclaimed
trolley track.