Still scratching the East German itch, a secondhand Roco 01.5 pacific joined the collection a while back, as did a German reference book on the class. Roco turned it out as 01.0525-4, but I have since swapped the cab and numberplates to represent the preserved 01.533 which is the property of the Austrian OGEG (Museum of Railway History).
Roco have a particularly good spares service, and you can order the parts direct from their website - delivery is in the order of 7 to 14 days.