I would suggest you have a replacement gear in hand before you cut that pinion off. I do not think it is a very common gear. Dennis Waldron might have one. The pinion is 726-29. There have been several threads on this forum about gear and pinion pullers. Use the search function to find them. They were full of interesting information. If the original pinion does not go back on the shaft tight, you can use Loctite 640 to hold it in place. The bearings for that motor, 2020M-16 and 2020M-17, are also fairly scarce. Make sure you get an original oilite bearing and not a reproduction turned out of 360 brass. Lionel thought that the oilite material would make the motor maintenance free, but it did not work out that way. Putting in a bearing that is mostly zinc with no way to oil it would be a disaster.
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