Rather than having to fill out the form for every car for every operating session, there are several possibilities. The same waybill could be used again and again, but then you have to find the freight car and match it against the waybill. And this also means the same freight car keeps getting sent to the same location. About several schemes for waybills were tried and discarded, we read about the Batavia Club's TIBS system. We adopted it and love it.
New members look at it with intimidation, but as soon as they start to use it, they understand it.
At every switching location is a blocking chart which specifies by TIBS code which cars to set out and picked up. Also on the front panel track schematic every siding is labeled with it's TIBS number. When a freight reaches a town the operator needs only to look at the blocking chart to easily see which cars he must set out and pick up. By grouping the cars in his train by TIBS symbol in alphabetic and numeric order the train will be automatically blocked. The TIBS system was developed by the Midwest Model Railroaders club in Batavia, IL and is a variant of the waybill in pocket system originally developed by Doug Smith.