Large Scale Central

Heritage Express 2-6-2 / Buddly L locomotive question

Does anyone here have or had one of these locomotives? This loco only runs when the tender is connected to it. I am just wondering if this is normal for this loco or not.

FYI: I also posted this question on MLS site.

IMG_0498 (Small)

And to save everyone time and effort, this question was already answered here!