Hang on are you saying the BTP used to check if trains were speeding? Which 'screen' are you talking about? The BTP have no operational knowledge of trains - they aren't even allowed in the cab!
We used to sit at Edinburgh and watch the "screen" of incoming trains
This showed the headcode, loco, rolling stock, current and previous locations, speed at location
I never asked what the machine was, it is probably called TRUST now
If the speed was above the line speed (known for this location) the senior manager would receive a phone call
The BTP would then be called to see if it was of interest to them
BTP would often sit and watch this
A printout would then be taken
The warning would be issued by the BR manager, witnessed by BTP
Once the warning had been issued the matter would then be passed to BTP
After the warning had been given by BTP the driver would often be suspended awaiting an outcome of the reported over speed and whether BTP were going to take the matter further (which would be known within a few days)
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The BTP have no operational knowledge of trains - they aren't even allowed in the cab!
Most officers don't but there are officers that do
When I was involved in the accident at Aberdeen an officer appeared on my next shift, and he clearly knew more about the procedures and operating equipment
Equally, the three officers at that accident all went to the cab
However this was primarily to ensure there were no other persons involved and that the train was secure
They also accessed all the coaches, including the motorail and generator van
They then wanted proof that the train was indeed secure and parked, which we had already done on the loco and brake van
They had also noted the brake on the generator van, but I advised them it was only needed if the brake van was to be removed and separated from the train
An officer could have access to a cab for various reasons, in the same way as they have more access on the railway than local police