It appears that the S-2 wheels jammed and broke the coupling from the motor to the one of trucks. Looking at the parts diagram on the Lionel site I found the parts I need. However, I have no idea how to take it apart the engine. Usually, you find a number of screws attaching the body to the frame. Looking at the top and bottom of the engine I did not see any screws that appeared to do this. Any ideas before I take it to the repair shop.
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