What is the minimal turning radius for a bachman spectum j class 4-8-4 (item number 82105)?
Will it require 22 inch or is 18 inch acceptable?
22 is the minimum! I own one and it will not take 18 without constant derailment. She'll do 22 just fine though. If you plan to run steam, the larger the curves the better.
-Brad
22 inches is the absolute minimum radius for this locomotive, 18 inch radius is not an option.
24" MIN for reliable operation, 30+ is much better. The real thing scaled down could not do 60".