The Fifty Francs coin is a denomination of the Swiss Franc. Given that Switzerland has four official languages, the Franc has three different names: Franken in German, franc in French and Romansh, and franco in Italian.
In regular circulation, the denomination is served by a banknote. These gold coins are non-circulating legal tender made for collectors and struck in proof grade only. They are issued in topical series, celebrating various aspects of Swiss heritage or nature. Swissmint has issued at least one every year since 2001. Initially, both sides of the coin carried a commemorative design; starting from 2004, the obverse is the same and only the reverse changes. (It is worth mentioning that some sources consider it the other way round, and call the commemorative part the obverse; however, we are going with the standard definition, which is that "obverse" is the side which specifies the issuing authority).
The edge is inscribed with the motto DOMINUS PROVIDEBIT (The Lord will provide - a quote from the Bible, Genesis 22, 8), and thirteen stars representing the original thirteen cantons of the Swiss Federation.
This coin marks the 100th anniversary of the famous Crocodile Locomotive.
The Ce 6/8 II electric locomotives, also affectionately known as the "Crocodiles", are more than just "old locomotives" for many people, and not just for Swiss railway enthusiasts. They combine Swiss cultural heritage with lively enthusiasm for a technical masterpiece created 100 years ago.
The powerful "Crocodiles" are among the SBB's most durable locomotives. In the spring of 1918, the Swiss Federal Railways (SBB) ordered ten "heavy mountain freight locomotives" from the Swiss Locomotive and Machine Factory (SLM) for use at the Gotthard. The specifications for these electric locomotives stipulated that they could cover the Goldau-Chiasso route twice within 28 hours with a train of 860t trailer weight. The special thing about the construction of the "Crocodiles" was the movable bearing between the drive frames and the locomotive box. Between 1919 and 1921, the series was increased to 33 units. The demands on the electric freight locomotives for the mountain route were enormous.
After the "Crocodiles" at the Gotthard were replaced by more powerful locomotives in the mid-1950s, they took over the transport of gravel trains weighing up to 1,200 tonnes in the Mittelland region. Some specimens have been preserved in working order to this day. SBB Historic offers special trips with the "Crocodile", and the electric old timer can also be admired in the Swiss Museum of Transport. | 
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