You can track containers on railroad websites. Some require a company login, which they manually approve. Others don't. Some require you to be a 'Notify Party',

You can track containers on railroad websites. Some require a company login, which they manually approve. Others don't. Some require you to be a 'Notify Party', others don't. The trains aren't being tracked. Containers are. And not real time. Rather it's a snapshot every 12-18 hours. Maybe what you're thinking of applies to the trains themselves? Or specific types of railcars?