Originally Posted by comcor
One thing I forgot to include there.
My ticket, which was issued by the collection machine in Kent Station at around 6:10am, failed at the barriers at Heuston at 9:10am. It had been kept in my shirt breast pocket the whole time, so hadn't been subject to any extreme conditions.
I don't know if that's a rarity or a more regular problem.
There are several ticket collection machines which don't encode the magnetic stripe.