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Control Tables are used in Railway Signaling to convert specifications of the
signaling requirement specifications to a form which can be applied to the
design environment. The design environment in turn is matched to control tables
so this process allows the signal specifications to be seamlessly adopted to the
design of the signaling system.
Control table as the name implies is a table. Control Table of a signaling system is normally prepared one for each interlocking unit and includes several tables. While there can be variations in the tables which are made depending on the system as well as practices followed there are two tables which always forms part of a control table
a) Signal Interlocking table
b) Points Control Table
The columns forming a Signal Interlocking table are not uniform and can vary depending on the requirements and practice. A typical set of columns which forms a Interlocking table is shown below:
Table 1.1
|
SIGNAL NO |
ROUTE TO |
TRACK
DETECTION |
SET LOCKS
DETECTS |
FLANK/OPPOSING ROUTE LOCKING |
APPROACH LOCKED |
APPROACH LOCKING RELEASE |
REQUIRES ROUTE NORMAL |
|||||||
|
|
ROUTE BLOCKED BY |
TRACK CLEAR |
OCCUPIED |
DISENGAGED BY |
SWITCH |
TRACK CLEAR TO |
AFTER
SIGNAL OPPOSITE |
OR TRACK
OCCUPIED FOR SECS |
|
TRK OCC AND CLEARED |
TRK OCC |
FOR TIME |
|
|
The signal interlocking table has one row for each route and the entries in the columns are the requirements based on the signal system requirement specification applied to the interlocking.
The interlocking arrangement at a station depends on the layout and the type of interlocking equipment used for achieving interlocking. The number of interlocking equipment will depend on this. For every interlocking a signal interlocking table will be created as shown above.