Re: Dates? Don't talk to me about dates...
"So why do they insist on specifying the weight of a car or locomotive in pounds?!"
Because deep down they know that they really want to use kilograms like proper grown-ups, but are just too scared to admit it to some of the MAGA-hat-wearing types out there?
(Arguably none of us gets it quite right: we perhaps ought to use Mg for quite heavy\\\\\massive things [1], and Mm for distances on the far side of the Earth, but we never do!)
[1] Quite heavy, as in the order of magnitude of 1 m³ of water (that always amuses me to think of, but I'd much rather that didn't fall on my head all at once).