Discount codes by Arriva Trains Wales is for single order only, discount at checkout. Arriva Trains Wales is not allowed to stack Vouchers. You can only choose to pay with the highest discount within the scope of your order. But you can also take advantage of other Arriva Trains Wales offers, like free shipping on Arriva Trains Wales products. Of course, your order needs to reach the free shipping amount to take advantage of this offer.