What is the opposite of "Destination" [duplicate]

What is the antonym of the word destination. Here is some context:

Every train has a destination and a ____?

I was thinking it might be origin but I've never encountered that word used in this context so I'm not sure - there might be a better word.

According to a Google search, the word origin is used as the opposite of destination on several pages on the Amtrak web site. Amtrak is the largest train operator in the United States.

Here are a few examples:

This schedule lists the Origin and "Destination" of various routes.

The Interactive Route Atlas page says the following:

Once you have selected origin and destination stations by one of the methods above, click on the 'Go' button to send your custom route request.

The Multi-Ride Ten-Ride Ticket page says the following:

Ten-ride tickets are valid for ten rides within a 45-day, 60-day or 180-day period depending on your origin and destination cities.

At least for marine shipping, "port of origin" is traditionally used. I think origin is appropriate for trains too.