Hello!!
No issue with height limits on an institutional level. although some smaller signal boxes are in the “duck or grouse” category.
Signallers medical is fairly stringent but most people don’t have too many issues, not sure as to how it compares to drivers to be honest
Long hair is no issue whatsoever, plenty of longer haired folk of all genders in the grades (myself included) and it doesn’t present any issues, tied or untied. (We have a policy of diversity and inclusion at NR that is taken seriously, this includes hairstyles amongst other things)
There are few if any strict appearance guidelines (nothing violating the D&I policy and red and green are restricted in a few boxes in case a driver should see it and take it as an instruction) , some of the more, quite frankly, backwards managers insist on uniform but that depends on location and is rapidly disappearing (and the NR uniform is a fairly broad church anyway). Some locations require PPE which is separate from uniform but, naturally, the company will provide that. No issues in sizing with those either (I’m of similar clothing size, though an inch or two shorter)
Hope we get to welcome you to the fold soon!!