Originally Posted by
nerd
Are conductors accustomed to looking for T/C's when you use an upgrade coupon?
You can't use the upgrade coupons on board the train. If you wait and hand the coupon to the conductor, you'll be left sitting in BC with the coupon still in your hand.
It must be done in the station with a ticket agent, whose computer will reject the coupon code if things aren't within the rules.