I've been thinking about this, and since there are so many possibilities that could theoretically work, we have to understand that it's better spread car types over as few yards as possible. Thus, putting R143s on the seems attractive because it would leave ENY yard with only two car types (R160 and R179) and 207 St yard with only one (R143). The question is whether there are enough R179s to displace all of the R143s from ENY, because if there are any R143s left there, there's no point in moving any to 207 St in the first place. The other issue is that if the is supposed to get R179s too, the R179s are no longer isolated to ENY and the cost savings of displacing the R143s are gone.