Cars destined for the New York Central, Boston and Main, or Delaware and Hudson interchanges have a blue band across the top of the waybill for easy identification. These cars always head south to the interchanges at Troy and the color coding is specified on the blocking charts. Likewise, cars for the Canadian National, Canadian Pacific and Central Vermont interchanges have a yellow band and all proceed north to Alburgh for interchange. How to Improvise an op session or How to run like the real railroads. There are two types of traffic, scheduled and unscheduled.
Scheduled traffic is very easy to handle.
It consists of everything listed in the switch list. Unscheduled traffic is a little more difficult to handle. Yardmasters have a number of decisions to make about how to handle traffic that is in their yard. If during the day a large number of cars arrive for the local industries then the yardmaster may need to schedule an extra to handle the traffic. Most locals should be kept relatively small, about 7-12 cars in length.