Smartlock 400

Smartlock 400 System (SML400) is a computer-based interlocking (CBI) system designed specifically as a successor to Solid State Interlocking (SSI) for all signalling applications in the United Kingdom.

Compared with SSI, SML400 offers:

• Reduction in number of cross-boundry communications required due to increase in potential size of interlocking coverage;
• A reduction in the physical size of central interlocking equipment;
• Compatibility with current communications technology;
• Updated facilities for the maintainer: graphical interface, improved fault analysis;
• Improved application engineering tools for test and incident analysis.

Smartlock 400, retains the Trackside Functional Modules (TFM) and trackside communications link that are used with SSI.

It can interface with a conventional signaller’s entrance/exit (NX) panel and is also compatible with VDU-based Control Systems, such as the Integrated Electronic Control Centre (IECC), or Modular Control System (MCS).

The main elements of a typical Smartlock 400 scheme are shown in Figure 1.

Figure 1
Main elements of a typical Smartlock 400 Scheme.