After Davenport acquired the locomotive business of Porter in 1950, were the subsequent "Davenporters" built at the Porter plant in Pittsburgh or was production moved to Davenport?

Production at the Porter plant ceased by the end of November 1950. Anything delivered after that came from the Davenport plant. Exactly which Porter was the last out the door is not known for certain. Porter records for the last few serials are incomplete. The service engineer for Westinghouse Electric recorded the exact shipment dates for the last couple diesel-electrics as part of his job, but several steam or fireless locos were in the mix too, and those dates are the uncertain ones.

There were a number of diesels built at Davenport from Porter designs. At a distance these cannot be told from Porters. Given that some of these were delivered years after the change, they certainly were not under production at the Porter plant. Davenport must have found the Porter designs superior to some of theirs and acted accordingly.

It should be noted that when Porter took over Heisler's fireless loco production in 1941 there was at least one and possibly as many as three Heisler locos finished in Pittsburgh and delivered with Porter plates. The one I am certain of is Porter b/n 7330.

Thanks! That answers a question that I had about the transition to Davenport.