Operating question

[Brakie]

Let's look at the prototype in less then a perfect world.
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More then likely those 2 tracks would be for holding overflow cars..

Now those 2 tracks could be empty for days at a time and then wham! there's several cars that needs to be held until the current car(s) is loaded or unloaded this is especially true for covered hoppers since the unloading is hampered by the storage silo capacity and a given shift production needs..

So,why not have cars spotted on those tracks every other operation session?

Don't forget there will be a need to switch these cars into their industry destination..I usually switch these cars into their industries without a replacement inbound load.