Hi, I hope you can help me - no matter WHAT i do - I cannot REMOVE the shell from my F45 N Scale Locomotive. With my Kato ones, the shell comes straight off - but this one just will not budge. I do not want to WRECK my loco - what can I do to remove the shell please? I have found on the net that the frame has four lugs that hold on the shell - I have used a small screw driver, then slid four toothpicks down next to those lugs, but the shell STILL will not come off - please HELP !!