Hi, I'm hoping for some advice. A friends father recently passed and he asked me to look at his fathers railway items. Among them was a Wrenn Devizes Castle that did not run. I have never had a Wrenn loco, but on taking it to a friend found the armature wrappings were broke. I have obtained a replacement three pole from Coopertrains and also new brushes and springs. It has the bearings in the housings at each end. The problem I have is that when on the track I can hear it buzzing, the armature will not turn. I'm not an expert with motors so would welcome suggestions as to what the problem is. It is all free turning and the chassis runs beautifully without the motor so it's not sticking wheels or crank etc. Thanks.