This article is written in British English, which has its own spelling conventions (colour, travelled, centre, defence, artefact, analyse) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus.
This article is within the scope of WikiProject Trains, an attempt to build a comprehensive and detailed guide to rail transport on Wikipedia. If you would like to participate, you can visit the project page, where you can join the project and/or contribute to the discussion. See also: WikiProject Trains to do list and the Trains Portal.TrainsWikipedia:WikiProject TrainsTemplate:WikiProject Trainsrail transport articles
If something is present then is it not by default a mass of some measurement? Otherwise if something is not present then it is non-existent. All the "things" mentioned as being applicable exist according to some plan or specifications then are they not by default present or mass. Regardless in what configuration they may be or design they are present and therefore mass. Even if you flung a Harry Potter Invisibility Cloak over it, it would still remain mass otherwise whenever that cloak is in use that which is under it would not be there. And the film clearly points out that the cloak hides not disappears something.2605:E000:9149:A600:3832:5234:5BA4:7DB6 (talk) 02:14, 24 June 2018 (UTC)[reply]