Locomotive expansion thinkfun compatible

This is my submission to the "thinkfun" challenge.
Full compatible with the existing thinkfun packs.

needed parts
- Rod 100mm 3pcs
- Rod 70mm 1pcs
- Plug 6pcs
- 2.5 inch connector 4pcs
- 6.5 inch connector 2pcs
- wielstang 2pcs
- locomotiefwiellager 6pcs
- afstaandhouder 20pcs
- middelgroottandwiel 1pcs
- kleintandwiel 1pcs
- wheel 6pcs



The most parts are existing parts