Created by Firaxis, the free scenario lets players "re-emerge as a former railroad tycoon, determined once again to redeem himself and more importantly, save Christmas! Help Santa and his elves make and transport toys to Santa's Station by the rapidly-approaching deadline."
It's a scenario that pits you against three other robber barons who are out to destroy Christmas.
The free download also includes a new holiday train with two skins and custom sounds (maybe sleigh bells instead of a whistle?), holiday-themed goodies like cookies, eggnog and toys, cheerful music to get players in the holiday spirit and a wide-open, rugged North Pole environment.
Grab it from sidmeiersrailroads.com in about a week's time.