Train List Data Type
nThe Train List allows the Resource Manager to keep track of which trains are blocked and which trains are active.
nTrains are switched between lists when needed resources are being used by another train and when those resources become available
nAll user commands search the active train list.  Commands sent to blocked trains are ignored by the resource manager
nWhen put on the blocked list speed is set to zero, when moved to active list speed reset to the last speed that the user issued
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