National Railway Company of Cuba

The National Railway Company of Cuba is currently the world's second-largest owner of GMD-1 locomotives, with 20 on the roster. If the GMD-1 itself wasn't unique enough for you, these are an even more unique subclass: each has one six-wheel truck and one four-wheel truck. Mark Perry explains:

    The 1100 series that were sold to Cuba were initially fitted with B-B trucks but these proved to be too heavy for the light Cuban railway infrastructure so the FCdeC bought a bunch of the A-1-A truck's from Canac (left over and sitting around after the 1100 series rebuild program) and fitted the front end of the GMD-1's with these used six axle trucks. While many retained the B-B truck under the cab, there many that were fitted with two A-1-A trucks as originally built, as well.