After researching this a bit, it seems I will need something more powerful. Through my examination of LGB locos with single motors, it seems that a small 2-4 amp power supply may be OK, but to power locos such as the 0-6-6-0 Mallet and RhB Croc which have 2 big motors you will need some thing much more powerful.
In short, my MRC will definitely not cut it!