Sorry but that's absolute rubbish. You're questioned under caution so that the facts can be ascertained, after all, the officer only has to believe offences to have been committed in order to report somebody for an offence. That being the case, due to questioning it may be ascertained that an individual either needs words of advice, or they have in fact done nothing wrong. By remaining silent or answering "No Comment" when under caution will almost certainly end up in court because the reporting TOC has no other option. They will have enough evidence to convict under railway byelaws at the very least,

Kalahati Do not stress and do not let the dealer take you for a crunchy ride. I had and still have issues with a trader I bought a car off for my wife, there were no faults listed in the advert but did state 'maintained to a high standard and can only be described as faultless'.. Wrong, the vehicle is full of faults but the dealer stated in an email in response to my letter 'the faults you state are fair wear and tear and to be expected, you were told of all faults before purchase and the vehicle is sold as seen as we do not test them or their functions'.. (how did they tell me about the faults that are wear and tear if they n