CNR and Kinder Morgan: Is it permissable to ship Sulphur with Wheat with Canola with Peas with Barley and Malt

The label on the tanker rail car shows Wheat, but is it?

Sulphur is a fertilizer used to grow wheat.

Is it permissible to ship sulphur in a vessel (container) that is also used for wheat and canola, peas, barley and malt.  Colley West at Vancouver Wharves

 Is it acceptable to mix a product for consumption with a poison?

Yukonomist

.... sulphur is always in demand. It is used for fertilizer, matches, batteries, bleach, laxatives, wine-making, shampoo and loads of other ubiquitous products.

Colley West