In the book "Sunset on the Rio Grande Southern" written by James L. Ehernberger, a photo on page 31 dated October 1959 shows Goose 3 with the loading platform, as well as a drumhead type Galloping Goose sign.
Based on what Jeff wrote here, later in this thread "Tom from what I know #3 was not used much if at all in the early days at Knotts. So for about 20 years she didn't run. Later she was moved to a remote section of track across from the depot for display. In 1973 I think it was 41 in the shop for an overhaul, then something happened to 340 then it needed to be shopped. So with no loco for the up coming summer they looked at the goose. Long story short it was rebuilt and ran that summer, and maybe that winter until either 41 or 464 was ready." I think we need to look a bit deeper to find the origin of the platform.
Dare anybody say, Another Wild Goose chase?