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Don't buy any replacements from the Bachmann chassis as it differs size-wise & mechanically from the Mainline original. As i see it, you have two options:
1) Unscrew the chassis from the body, then unscrew the plastic keeper plate from the bottom of the chassis. The usual cause is that the metal halves of the chassis are very brittle, some of it has broken off & is jamming the geartrain. This metal normally fractures around the jackshaft, if this has happened, that's the end of your 03. If not, apply power direct to the terminals on the motor to check if the motor is u/s or not. If either the motor or the chassis frames are knacked, then -
2) Look out for a 2nd hand Bachmann example as a complete replacement, you should be able to get one for £25ish.
Dave.
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