The Vossloh G1700 BB is a four axle B′B′ medium power diesel-hydraulic locomotive manufactured by Vossloh Locomotives GmbH. in Kiel. The locomotive type is operated by private rail operators in Germany and Austria. In addition, a large order from the Swiss Federal Railway resulted in a variation of the locomotive, designated Am843, now also operated by other rail companies in Switzerland; this variant represents the majority of the locomotives of this type produced. Locomotives equipped with a Caterpillar engine are sometimes referred to by the sub classification G1700-2.