Deletion of List of steepest gradients on adhesion railways

Comment: We don't need the list to be sourced in its entirety to a single source, which is what those arguing for deletion seem to be implying. What we need is sources that establish that the topic is notable (which does not seem to be a serious area of contention in this case), and sources that give the numerical values for each entry. Ordering the list by numerical value is to my eye self-evidently covered by outine calculations. The possibility that the list is incomplete is not a reason to delete the list—we have {{tl|Incomplete list}} for that exact situation—but it is a reason not to rank the list (are we ''sure'' number 33 is really number 33 and not number 34?), which indeed we don't with this one. These arguments apply to all lists of superlatives by numerical values. For instance: if a new film is released that would qualify to be included on the list of longest films, we don't need to wait for some external source to provide an updated version of the list that includes the new film, we can simply add it in the proper spot by noting that e.g. 8 hours is longer than 7 hours but shorter than 9 hours
Stance: keep
Cited policy: Wikipedia:Redirect (WP:R)