The application was originally developed on the Acorn Archimedes and Risc PC computers, due to their superior operating system and ability to handle vector graphics and perform anti-aliasing as part of the standard minimum configuration.
Conversion of this application to run under Windows was greatly facilitated by an excellent piece of software called 'BBC Basic for Windows'. A description of the conversion is given for those following in the same path.
Click on the image below to download a simulation of a mechanical signalbox which operates on IBM-compatible PCs and offers a full, accurate simulation of a number of signalboxes. A full service of trains is available for Exeter West and Kidderminster Station. The boxes supported are Exeter West (1963), Kidderminster Station, Morlais Junction, Radyr Junction (1961 and 1987) and Bewdley North (1956).
A full set of help files is provided and may be viewed here: Windows .HLP file.
This is a software simulation of the inside of a signalbox - showing the track diagram (the area controlled by the signalbox) and includes the points and signals, numbered to correspond with the levers used to operate them. The levers are interlocked, exactly as in the real box on which it is modelled. For two of the boxes modelled, a full sequence of trains is available and the track circuits on the diagram will light up as you give permission for the trains to proceed. The application is provided with comprehensive information about the process of signalling and how the simulation operates. Context sensitive help messages are available and will appear depending on what is under the mouse pointer, displaying a bubble explaining what the item underneath the mouse does or showing its status. The documentation provided with the application explains the first steps and gives a lot of background information. To view this documentation click on this link.
The latest version now includes a 'demonstration' mode where it will run through the whole of the timetabled train service provided, with a commentary showing (by a direct demonstration) how an error-free shift can be undertaken. A screen shot from this is given immediately below with an explanation of what can be seen.