Here ya go, Gary!
Both the male and the female parts come in a long strip, as shown - various lengths are available. I use a utility knife to cut them through, at the grooves, into whatever configuration I require.
Here's a typical installation, between the loco and tender of one of my modified Athearn Mikes. There's lots of room to cram the plugs and excess wire into the tender, so I didn't bother to shorten the pins. I used some insulation stripped from some slightly larger wire to insulated the connections. I also drilled a very shallow depression into one side of each connector, then added a touch of red paint, as an identifier, so that the plug gets put together properly.
This shot is just to give you a better sense of scale. You can trim the pins as short as you're capable of soldering a wire to, by the way.
For using these between diesels, I'd suggest using two single-pin plugs, with the female components mounted right into the end plate of the pilot. The male plugs, shortened (ouch!) could be mounted on their wires, similarily protruding from holes in the pilot. The pins are almost square in cross-section, and I used a file to slightly round the corners. This made them fairly easy to plug or unplugged without affecting the connection.
It may not be of much help, but the label on the female plugs reads:
SIPSKT 2.5mm 32S BRST TIN BLK
then a upc symbol,
16 1596
ACPC-7312-1
On the male plugs, the label reads:
SIPHDR 2.5mm 2P BRST 3/6 TN
with a upc symbol here
173512
ACNC-1231-15
Wayne