Minimal turning radius for spectrum j class 4-8-4 (ho scale)

[davidmorlando]

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?

[NWsteam]

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

[ACY]

22 inches is the absolute minimum radius for this locomotive, 18 inch radius is not an option.

[Nigel]

24" MIN for reliable operation, 30+ is much better.  The real thing scaled down could not do 60".