Despite the enormous amount of bicycle parking near the Leiden train station, there are never enough spaces! The underground facilities are always double stuffed. Many cyclists will jam their bicycle between two full ground level spaces.
For this reason, I usually try to take a top rack position.
(Jamming leads to bent wheels, trapped fender spokes, caught cables, loud swearing and loss of composure...)
On my way to (parking for the train, I'm so lazy these days) work, I saw city sanctioned workers doing a weeding of the bicycles in unapportioned bicycle spots.
Most of the weeding I have seen before was for bicycles that were forgotten and left in one spot for more than a few months, but this was for nice shiny bicycles that were jammed in by harried and hurried riders.
Amusingly, the city workers were not more enterprising than the cyclists and only weeded the front section closest to their truck.
Doei Doei bicycles!
Apparently, the City Hall will maintain a registry of these bicycles and charge a fine to pick them up from a warehouse. I'll post some links when I find them...
Leiden City bylaws: http://gemeente.leiden.nl/projecten/bereikbaarheid-portal/fietsen/fietsbeleid/
Phone number to inquire about bicycles, (071) 516 5503.
And, to get your bicycle back, you can visit Willem Barentszstraat 20, Monday - Saturday and pay the €26 euro fee.