I found it very easily. The step by step process is as follows:
Step 1, Enter http://www.lionel.com/ into your web browser.
Step 2, Click the "support" tab in the upper right corner of your screen.
Step 3, Click on the service documents tab on the middle right of your screen.
Step 4, Enter the product # into the search bar, (in this case 6-18071.)
Step 5, Click on the manual link that is displayed.
Step 6, Read the manual to find out what you need to know.
I hope this helped.