I've been making careful anecdotal observations about exactly this lately.
Coal and trash seems to have two, every time. And they're always big fancy new ESwhatevers.
General and intermodal has an ESsomething on the front end, and a hodgepodge of 2-3 (sometimes way more) others. I see a surprising number of SD40-2s sandwiched between widecabs on the longer general freights. Every once in a while I'll even seen a GP30 in there too.
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