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Interlocking system is one of the core systems for the signaling system. An
interlocking system for a typical station layout is firstly designed and developed
to ensure a right route establishment. In the interlocking system, the basic
interlocking logic relationship among the routes, switches, and signaling must be
strictly ensured for the typical station layout. Usually, strict algorithms are used
in the core systems to guarantee that conflicting routes can never been
established in the same system.
After an interlocking system is designed, it must be tested thoroughly. Based
on the station layout, a complete test set should be built. Possibly, a simulation
system for the interlocking system is designed to test its logic functions. The test
will ensure the correctness and the safety of the system.
Before an interlocking system is designed, the specifications of the system
requirements and the system functions should be finalized. The specifications are
the basic files of the design and the test. Of course, the typical station layout
must be defined to ensure the functions of the interlocking system to be
complete.
As the core system, ATP system (one of the on-board system), RBC system,
the central control system, and the communication network connecting the core
systems should be designed and developed. The processes are the same as the
design and development of the interlocking systems. The classification and
process can be found in the files of ETCS and CTCS in Ning et al. [3].
In order to design and develop the core system, the prototype for the core
system should be designed and developed. Design and development of the
prototypes for the core system of the signaling system must obey the design
principles of the software engineering. It is divided into the three levels. The first
level is the system management level to operate the whole system management
including the safety requirement in the vital computer. The second level is to deal
with the logic requirements of the systems, i.e. the function rules. The third level
is the application level to match function requirements and an application
database. Fig. 3 shows the relation of the three levels.
The core systems of a signaling system should include six units based on the
four parts. They are the central control unit, the station control unit, the RBC
control unit, the on-board control unit, the communication network unit and the
wayside unit with radio unit. The six units consist into a minimal signaling
The minimal signaling system is the foundation of an
application signaling system, and meets all the function requirements of a
signaling system. Usually, only the prototype of the minimal signaling system
can be found in laboratory.
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