i have been asked to fix a LIMA Great Western 47830 loco for a friends child, but know nothing about them! does anyone know how it should be wired? there seems to be one black wire coming from the pivot pin that allows the non powered bogie to move. this is loose inside the case. the powered bogie has what looks like two possible solder points, one near the motor spindle, one near the front wheel. should there be another wire as well? where should the wires run? the other problem with it is there seems to be a cog missing on the gear train to the front wheel of the bogie, although the rear wheel set gears appear in tact. will it work, or am i better off throwing it in the bin?!