Tornio River Railway Bridge - Credit: Wikimedia Commons
The Torne River Railway Bridge is a dual gauge railway bridge between Haparanda, Sweden and Tornio, Finland; the bridge can be used by the 1524mm gauge trains of Finland, as well the 1435mm gauge trains used in Sweden. A temporary ice river track was built over the Torne River in 1917. Read more on Wikipedia
Source: en.wikipedia.org