Roger,
The Lionel TMCC TPC Cable Set, 6-14194, has two of what you're looking for (mating connector with pigtails) in it, however it also supplies two of the opposite connector with pigtails as well. If you don't mind getting these extra things that you don't really need this would be the easy way to go. I haven't yet checked the Lionel website to see if they still have these in stock.
The source on the bay that used to supply just the side that fits the PH-180's connector is no longer out there.
Alternatively, what are available are the Molex components used to make the connector-and-pigtail assembly, as long as you don't mind making your own.
These are the Housing: Molex 03-09-2032, and Pin (Male): Molex 02-09-2103, from a number of different Electronics Supply Houses such as Mouser.
Mike