This pigtail connector is used primarily to connect speakers to TCS WOWMotherboards, as well as other uses.
Some of the motherboards they provide have 2-Pin JST connectors for connecting the speaker and if you choose to use a speaker other than the one that comes with your locomotive you will need one of these connectors to plug it in.
Attached to the 2-Pin JST connector are 2x 30 AWG violet wires for hard-wiring to your speaker (or other application).
