Originally Posted by
zucchinni
FPC = full price coupon
A train is an envelope full of coupons that starts at the conductor (person who decided to host the train). That person sends the envelope to the passengers. The first passenger takes out what they want and puts back an equal amount of coupons ( I usually add more than an equal amount). they then send it to the next person on the list, until it ends up back at the conductor.
Yes, I guess some people used to send used stamps (not very nice).
Hope that helps.