Since Jerry started the Toilet Car thread, I though I would I would follow up with the "industrial sized" model.
This car was designed/mfg. by Orrenstein & Koppel to spread/discharge fertilizer (Human & Animal waste). It was built for 600mm (+/-2 foot gauge) and iether 900mm or 1000mm (+/- 30-36 gauge). The promary source for locomotion would have been animal power or a light locomotive. These were used in agricultural and plantation operations, most often on light sectional track.
The top 3 thumbnail pictures show the catalog cuts of the car, and cuts of the light and medium version bogies. From these cuts, I extrapolated the large 3D drawings of the frames to use as templates for a model. In 3/8 or 1/35 scale the Ian Lindsay water tank, or one of the O-scale Westside coffin tanks might make an easy ready to use tank. The thumbnail of the frame drawing below the cuts shows the image for a narrower car (more like the catalog cut) and more for use on 600mm gauge.......the 3 larger images show my interpretation for a frame for a wider 30 or 36 gauge car.
Marc
(https://www.finescalerr.com/smf/proxy.php?request=http%3A%2F%2Fhome.earthlink.net%2F%7Erbadesign%2FWC_Frame_S3Q.jpg&hash=48254629508ef635edfe97aabac65139f99a7238)
(https://www.finescalerr.com/smf/proxy.php?request=http%3A%2F%2Fhome.earthlink.net%2F%7Erbadesign%2FWC_Frame_T3Q.jpg&hash=ce0fa6d3c3c7809e7d609842438ada60a330a47a)
(https://www.finescalerr.com/smf/proxy.php?request=http%3A%2F%2Fhome.earthlink.net%2F%7Erbadesign%2FWC_Frame_Underside.jpg&hash=d66ac07746c8914558480631e2369dcc0956453b)
This is the dimensioned line drawing for the car frames. The bogies are laid out for 2-foot gauge.
It is not to scale, and it may be necessary to download the image in order to see it more clearly.
Marc