Most manufactures will require you to send a copy of the original invoice. You can reprint one by logging into your account or locating the email you received from us.
Here are the links you need to return an article to the manufacture for warranty exchange/repair:
Atlas: https://shop.atlasrr.com/t-warranty.aspx
Bachmann: https://www.bachmanntrains.com/home-usa/service.php
Broadway Limited: http://bliservice.com/warranty-options/
Bowser: https://www.bowser-trains.com/contactus.html
Digitrax Warranty & Repair: https://www.digitrax.com/support/returns/
ESU: http://www.esu.eu/en/support/warranty-repair/reparaturen/ruecksendungen/
Kato Warranty: https://katousa.com/kato-limited-warranty/
Kato Repair: https://katousa.com/returning-a-locomotive-or-car-for-service/
Lenz: https://www.lenz-elektronik.de/info/service-support.php
NCE: https://www.ncedcc.com/service-information
PIKO: https://www.piko-america.com/pages/contact
SoundTraxx 90 Day Warranty: https://soundtraxx.com/support/decoder-warranty-policy/
SoundTraxx Service Repair: https://soundtraxx.com/support/product-repair/