Matt uploaded this video of CN 594, an empty potash train on its way to McCullys to drop the empty cars off.
He's been busy shooting the potash trains. Here's another of his from a month ago.
The trains run from the PotashCorp mine at McCullys outside Sussex, down the CN Sussex subdivision to Saint John and over to the Courtenay Bay wharf. They used to run a mixed bag of CN hoppers but in the past few years they have been using the orange cars seen here.