I have been wanting to adapt the 0507 Meccano Erector Hudson for O gauge(the original G gauge version is also shown in my gallery here)for some time now, but it seemed a very difficult task, which I have managed now. As you know the original locomotive was for G gauge. I have never been able to figure out why it uses plain non flanged wheels which are kept on track by the front and rear pony wheels. I had to change the latter from plastic to metal as I wanted to run the locomotive with current through the tracks, the original is run by battery. I have used Erector wheels, as I could not make it balance with the No. 20 or 20b flanged wheels. I have changed the boiler front also.