I'm assuming you mean there is just the big white box as the train exterior instead of a detailed exterior. The R62A downloadable here currently does not have an exterior, however the R62 (which someone gave you the link to in an earlier thread you made) does. As they are pretty much the same, if you want to make the R62A have an exterior like the R62, simply copy the folder for the R62 exterior as well as the extensions.cfg from the R62 folder and move them to the R62A folder.
