This happened AGES ago in collaboration with M.H.; really, years.
Photographs of train windows were shown in the toilets of a first great western swansea to london train. The toilet window are a lovely ground glass lightbox type affair.All the images in standard class were of port talbot, and all the toilet windows face the stell works. Neat. First class had images of train windows in london.
Train windows are an ongoing (about 25 years) project.
I only had a snappy sort of film camera with which to document.
must post the bus shelter exhibition....