The file 'Floating Mattress In 1:87 H0 Scale 3D Printer Model' is (stl) file type, size is 2.3MB.
This Floating Mattress is slightly too small for you but a perfect fit for a 1:87 H0 model train scene :)
For more inspiration:https://enelys3d.netlify.app/The_Floating_Mattress/