This clock is variable from 1 to 1 all the way to 12 to 1. In a club setting, members like to bring in their own equipment to run during a session, so you get a hodge-podge of engines. It make little sense to make a challenge of accurate scenes, industries and operations if your motive power is Hungarian goulash. 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.
Once difference that we have made is use of the computer to maintain the proportions of the traffic rather than by the proportions of the waybills you write for each industry. The computer generates the randomness rather than shuffling the deck of waybills. This saves considerably in the number of waybills you need to write. Recently, we devised the final step in making the sessions work, what we call the Point System. This quantifies both good and bad behaviors at the session by awarding positive and negative behaviors with points.