This is a N Scale ladder that you can cut to length or print more of and glue together if needed that can be attached to a building, tank or other structure.
It resembles what you would find permanently attached to a structure.
You can also print a safety cage that can be added to the ladder or print more than one if you want a safety cage over a longer length of the ladder.
Another option lets you print a platform that goes on the top of the ladder where someone would exit the ladder and walk out on top of the structure.
Above is the finished ladder on a tank that you can also print out in any height you want.
More about the item here ...
And the files to print it here...