Reg Points Crank Handle - Locking in Control Table

[khalid]

In the UK there is no locking with crank handle; indeed the days of "release from signalling panel" are long over and it has been just under a padlock security local to the points (for at least the last 25 years I think).
However other practices vary and I certainly have heard previously that this is the practice in Indian Railways, so if those are the practices you are adopting for your control tables then do show the interlocking.

Actually it is not the crank handle itself which is interlocked into the points circuit but a key which is kept locked into a KLCR(Key Locking Relay).In order for the point proving relay(NWKR/RWKR)to pickup,this key must be proved "in" in the KLCR.
Hence,if any maintenance work needs to be undertaken on the points which needs hand-cranking,a slot can be released from the panel for the concerned point.Once the slot is released,the key becomes free in the KLCR and can be removed and then inserted into the point machine.The crank handle is kept in a glass-fronted padlocked and sealed case.The handle is removed from the box and it can be used to operate the machine.Entries in appropriate registers need to be made.
The interlocking itself is relatively simple in that the concerned NWKR/RWKR of the point will pickup only if the slot is not released and the key is inserted and locked in the KLCR.The front contacts of the NWKR/RWKR are proved in the signal clearance relay circuit.

Khalid.