This is a variant of my
Prop-Like 4-Wheeled Composite Coach Interior, redesigned with an extra row of seats for coaches without windows on the end, such as the Red Branch Line Coaches and Emily's Coaches.
Requires painting to finish, and may require some sanding to fit.
To insert into an off-the-shelf Bachmann model, the roof and window glazing piece must be removed carefully. This can be done by gently heating the plastic body with warm water or a hair dryer, and gently prying the roof and windows piece away from the body with a blunt screwdriver or other prying implement. Removal of factory-installed body weights may be necessary.
It should fit snugly.
If it is too large, sanding may be required to make it fit.