There are special wagons for transporting grain , e.g. [1] or [2], the main difference being that those are covered, whereas the standard bulk freight wagons ar

There are special wagons for transporting grain , e.g. [1] or [2], the main difference being that those are covered, whereas the standard bulk freight wagons are open and therefore not weatherproof. Before running into any length limits, the limiting factor at the moment will actually be the screwlink coupling, though. Using the wagon from [2], 720 m [3] would fit 48 wagons, which fully laden would weigh a total of 48 * (70.1 + 19.9 t) = 4320 t. A standard buffer and chain screwlink coupling is only good for around 4000 t on a level gradient, 2500 t at 12.5 ‰ (1:80), or in really mountainous terrain only 1400 t at 26 ‰ (1:38.4) [1] https://gueterwagenkatalog.dbcargo.com/katalog/nach-gattung/Tadgs-959-0-5851226 https://gueterwagenkatalog.dbcargo.com/katalog/nach-gattung/... [2] https://www.wascosa.ch/wagenpark/pdf/de/schuettgutwagen/getreidewagen-95m3_de_201910.pdf https://www.wascosa.ch/wagenpark/pdf/de/schuettgutwagen/getr... [3] In Germany the maximum length is 740 m, minus 20 m for the locomotive.