Headup Games announces the release of a new Trains expansion pack on Steam for Bridge Constructor, their arcade engineering game. The new add-on further challenges your design abilities by requiring your structures to withstand the rigors of train travel. Here's word on the release, which comes on the fourth anniversary of the launch of the original game:

In celebration of the 4th birthday of the million selling franchise Bridge Constructor, Headup Games and Clockstone Software released a new add-on called 'Trains' today.
Test your construction skills on the new "Choonited Kingdom" island group, with a total of 18 new levels across three islands.
(Not even sorry for that pun. :)
To get the extremely heavy trains secure over beautiful rivers and some dizzying deep ravines, you have to build even stronger bridges this time, or otherwise everything will collapse in a spectacular disaster!