One kind of new locks, coming from Pickersgill-Kaye which traditionally supplied the majority of toilet door locks on railway vehicles in the UK, supplies with a microswitch fitted within the striking plate assembly which can be linked to a remote toilet status indicator which illuminates when the toilet is in use. To provide long term reliability the indicator uses the latest LED technology.

There is another developed door lock which interfaces directly with the toilet waste tank also by this company. The lock operates normally until the waste tank becomes full. Once full, the door automatically locks out and can only be opened by traincrew staff in possession of the appropriate override key. A field trial for this new system is currently ongoing on a class 165 train in co-operation with Interfleet Technology.