Look at diagram. 2 screws 10489 X2 should be removed to get the shell of. On front of tender. Joe
https://www.bachmanntrains.com/home-usa/dwg/dwgs/HOBALDWIN4-6-0(DCCREADY).3.pdf
https://www.bachmanntrains.com/home-usa/dwg/dwgs/HOBALDWIN4-6-0(DCCREADY).3.pdf