A major newspaper recently did an article on a public facility which has problems controlling their master keys. I'm omitting the city and paper for obvious reasons.
The only problem is that the illustrated the article - with a photograph of the key (looks like a Y1 blank), including the bitting. Unless, of course, they managed to obtain a well-worn key and stamped it with the same letter designation mentioned in the article.
The key in question is very unlikely to be a masterkey by strict definition of the term - it is a pass key, one that fits many keyed alike locks. Assuming 'Y1' refers to the traditional Yale paracentric keyway (aka E1R or
8) there is no difficulty getting keys cut and it seemed that the normal way of supplying new staff with keys was for the staff member to borrow his supervisor's key and get one made. No doubt the keys were regarded more as screwdrivers, allen keys, etc than real keys.
In simpler more peaceful times a transit operator or utility could get away with using keyed alike locks and padlocks on its facilities and giving all staff a key. For example one power utility used a shackle with a triangular head screw to secure its facilities including important sites which are now secured by access control.
The facility in question is obviously in need of a security revamp with the keys in question being relegated for restrooms, etc.
"change key " n. 1. a key which operates only one cylinder or one group of keyed alike cylinders in a keying system,
any device that is used to mechanically or electronically allow resetting of certain key or combination locks, see also "reset key" #1 "reset key" n. 1. a key used to set some types of cylinders to a new combination. Many of these cylinders require the additional use of tools and/or the new operating key to establish the new combination. 2. a key which allows the tabulations on various types of cash control equipment (e.g., cash registers) to be cleared from the records of the equipment