Tony Tompson has written extensively on car moment, waybill creation and operations on his blog. One series of his I have found particularly helpful is Operations: Demand Based Car Flow.
Using Tony's methodology and generating a distribution schedule of sorts based on the industries on the Yacolt Branch highlighted a problem with my proposed layout. The Yacolt local ended up being over 10 cars long to service all the required industries if I modeled Homan through to Yacolt.
At the same time i have been struggling to fit all Homan through to tunnel 1 on 1 deck of the layout.
My aim for the layout was to generate enough traffic that I can run one freight local a day and additional passenger service / dedicated log trains. Using my sample schedule I found that restricting the layout to service only industry past Battle Ground the car lengths averaged out at 6 cars. An acceptable length for my layout.
|Sample Distribution Schedule - showing cars arriving on layout from staging.|
This will result in the following trains:
- Yacolt Local - Departing Staging (Vancouver junction) through to Yacolt and return
- Daily passenger service AM and PM service
- Murphy Log Trains
As a result its back to the drawing board and track planing for the lower deck with the new school of thought.