The responsibility for ordering stationery supplies at a railroad company by assistant station supervisors is specific to company policy and is outlined in document 1-186, which was not provided. Therefore, without access to this document, it is impossible to answer which specific tour (shift) is responsible for this task.
The question pertains to the operations within a railroad company and focuses on the specific responsibilities of the assistant station supervisors concerning the ordering of stationery supplies. The scheduling and tasks assigned to different shifts or tours within the company would fall under business operations and logistics, which leads one to assume that the correct answer would likely be found in the company's standard operating procedures or employee handbook, documents that would outline the roles and responsibilities associated with each shift.
As the specific tour responsible is not universally standard and can vary from one company to another, this information would have to be taken directly from the provided document (1-186), which is referred to in the question. Without access to this document, it is impossible to determine which tour is responsible for this task.
So, without the referenced document, it is not possible to provide a definitive answer to which assistant station supervisors' tour is responsible for ordering all stationary supplies used by railroad clerks.