Okay I got a caliper and measured the drive shaft from my other Chuggington train engine. Hopefully I labeled everything well enough. Thank you again. Please PM me what the label & shipping cost will be

Here is a link to a diagram I made
https://www.dropbox.com/s/wlxvgy540kpr698/Drive%20Shaft%20Diagram.jpg?dl=0

Sorry for taking so long to get back to you. I'm trying to get my hands on a good caliper so I can get accurate measurements.

That would be amazing! Let me see if I can't get a blueprint or pictures and measurements of the part. I have one on the other wheels of the train.

I bought my little boy a Chuggington train engine 2 years ago. When he was pulling it out of the packaging at Grandma's and it fell on the floor and a few pieces came out. We thought we gathered all pieces up but noticed we were missing one when we got home. I have searched high and low for the piece over the past two years and Bachmann finally responded to me saying they no longer carry it. My boy has never been able to use his train and he asks me all the time if I've found it so he can put it together.

Does anyone know where I can get this part?

This is the part in question
https://estore.bachmanntrains.com/index.php?main_page=product_info&cPath=68_630&products_id=7246&zenid=t0skc32fmeqgd59gltc7050dq6