Random List
From TrainzOnline
When started, the Random List rule randomly selects and executes one of its child rules. Once the selected child rule is complete, the Random List completes. If any further executions are required the rule must be restarted by a parent rule.
As a child rule is randomly selected during each list cycle the Random List rule shouldn't be relied upon to execute one particular rule. Being random there is no guarantee that a specific rule in the available selection will ever be executed.
Random List is one of several list rules for handling child rules in a specific way. See also Ordered List, Progressive List, Reset List and Simultaneous List.
