If this model is anything like the closely related Ivatt 4MT 2-6-0, which has two pipes from the steam fountain down to the injectors on the firemans side, then these two pipes are a tight fit in the top of the injectors. Patient wiggling with a pair of small tweezers persuaded them to separate.
In common with many Bachmann steam models, the chassis on this item was also a very snug fit in the body, and with every hand hold in close proximity to fairly fine detail it is all a bit fiddly, which increases my enthusiasm for decoder socket in tender whenever possible. But all that said, none of the detail was detached.