The vouchers won't operate as currently, the club's plan A is that you'll get a £3 discount off the cost of the train/bus ticket that you've bought. Quite how that's going to work with online purchasing, unmanned stations and automatic ticket machines I wouldn't know but maybe this is an example of the lack of attention that's been (being) paid to transport arrangements at the Amex.
Had my presentation on 4th feb and Richard Hebbard categorically stated the above is not the case, vouchers bought in books of 25 for £25, use 1 per game for p&r train or bus the same as the vouchers work now