This is a replacement set of 4 axles and drive gear for a N Scale Bachmann 4-8-4 Northern (3rd Generation).
These are designed to replace original split axles, the intermediate gears are optional and don’t always need replacing. Please note: The larger twin gear is still under development but all the others work well.
These parts have been designed for Smooth Fine Detail materials.
For more information please see my blog - www.jamestrainparts.wordpress.com