Re-design of application of the core system for the specified rail lines

After development of the core systems for the signaling system, there we have
the prototype of the minimal signaling system. Before the application of real
signaling system, redesign must be carried out for an applied line based on the
core systems and the minimal signaling system. The main task of the redesign is
to match the database of a real line and the minimal signaling system with the
core systems. The redesign turns the minimal signaling system into a real
application signaling system. It needs experts with good skills, while the
importance of the step is often ignored. The designers need to know both the
core systems and all the requirements of the application line. That is why the
signaling system is called as requirements-tailed system, and it costs.
During the redesign, the database for the line and rolling stock must be
established. For example, some parameters such as curves and slopes of the line,
the parameters for rolling stock, traction features and braking features of rolling
stock are needed for the on-board system (ATP or ATO). An interlocking system
needs the data for the layout of each station along the lines. There is different
number of routes for different station. At each station, the number of switches
and the positions of switches are different. For the central control system, all the
data from the lines and the requirements are needed to general a train plan and a




train operation graph. At the same time, the disposition of communication
network units and wayside units such as position of design for radio units and
balises must be carried out.
In order to simplify the redesign without reducing the correctness, a
computer-aid design (CAD) tool is developed. Different CAD tools are designed
for the different units, such as Interlocking CAD tool and RBC CAD tool etc in
Mitchell .
After the redesign of an application signaling system is finished, the whole
system is test to verify the functions and safety. To test the signaling system, a
simulation system and environments should be built. Test set and test dictionary
for a line should been accumulated and established to ensure the test.