S Viemeister wrote:
I'm sorry about the off-topic, but I thought one of you might know the
answer.

I've just booked a train ticket for my husband, to be picked up at the
station. It's my credit card account, he's an authorised user. He can't
find his card...it's possible the wrong one was tossed when the new one
arrived, as he CAN find the old one.
I've heard that in the recent past, people have been able to retrieve
their paid-for tickets from the machine using the reference number and a
card other than the one used to make the booking, if that card has the
correct name on it. Anyone know if that's true?, If not, I'll need to
make another reservation (and will have wasted the cost of an
Edinburgh-Inverness ticket).

The short answer - it depends.
Tickets booked by travel agents can be collected with any card. Some
booking sites set this for all tickets, so all tickets booked through
that site can be colelcted with any card. Some ticket machines accept
any card even if the booking site hasn't said to do so. However, if the
site and machine both require the correct card, then only the correct
card will do.
However, the booking site customer services can change this - give them
a call and they should be able to change the card or allow any card.

Mike