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If they were going to manipulate journey behaviour to increase farebox revenue, they could do it far, far more effectively than a tiny minority of obscure late-evening flows that just happen to affect you in particular.
Also, it's unclear why you even think you need to change at Highbury rather...
Point of order: pen testing (penetration testing) is a legitimate commercial service. Those who might use the term to describe their own amateur activities are doing so incorrectly.
A good comparison would be using "locksmith" to incorrectly describe a jewel thief.
As far as I am aware, Underground runs at a profit, but roads are a big loss-maker that TfL as a whole remain responsible for. Do comparable cities operate the same model, or are we comparing Metro operators with TfL's entire estate?
The signalling & pointwork theoretically allowed it, not sure whether it ever happened in practice. But the 'compromise' rail height was maintained until the changes.
4LM signalling required the Piccadilly and District to lose their track-sharing capability in the area, so along with points removal, the opportunity was used to raise the Piccadilly trackbed.
LEDs, especially bright ones meant for illumination rather than just indication, do require a decent amount of cooling. A poorly designed case might be plausible to explain premature failures.
It's best to set aside this sort of thinking. If the railway thought you were a fare-dodger, they would be investigating for prosecution.
But instead they issued the Penalty Fare, which is designed for genuine mistakes like the one you made — even if it feels too harsh. This means they already...
The passage regarding NR barcode tickets would seem to imply a short-term loophole whereby misuse or forgery of such tickets is not something LU are able to enforce against. Nor would it even be detected at stations not participating in the trial scheme!
We are aware of an issue with emails from the Forum to Microsoft-based email accounts (hotmail/outlook/live.com email addresses). This is being looked into currently, thanks for your patience meanwhile.