Function often takes precedence over form when it comes to doors and hardware destined for a rail network, which demands robust, long life-cycle solutions. The ability to withstand high use, and often abuse, is a must. The highest priority single issue is protection against fire; critically so in underground locations. Accessibility is also a key specification factor.

Visual design input identifies the need for an attractive yet durable finish to fit effortlessly with the no-nonsense ethos of such a hostile environment.

Flagship transportation projects often raise additional aesthetic or navigational considerations and lend themselves to a more subtle, colourful approach, whilst still retaining the performance criteria. 

The ability of any user recognition system to provide a positive ID is paramount. Any registration process should be quick and simple; subsequent verification readings should be reliable. PIN codes are in themselves insecure, as they are easily revealed. Physical tokens - cards and tags - do not fair much better as they can be lost, stolen or cloned; they can get broken or passed on to others and used for 'buddy-punching'.

A unique biometric credential however - such as a hand - cannot be compromised. Hand geometry readers have a high read accuracy even in circumstances where hands become soiled; they are also the least invasive, and therefore the most widely accepted, biometric technology.

Traffic control, in the form of barriers, lights and audio-visual communication, provide the interface with the physical world and must form a dependable and secure barrier to unauthorised access. Any worthy system will also offer comprehensive management tools such as remote monitoring, audit trails, real-time tracking and Fire & Evacuation Muster control.