If you can take photos of trains at train stations, which I have done and in the presence of British Transport Police, many times then I do not see any issue taking pics of buses and trucks etc. Network Rail say that photos can be taken at stations as long as flash is not used, tripods don't get in the way of passengers and that the photos are not offered for sale.
I really do not see what harm is being done by enthusiasts photographing transport. No real difference to taking a picture of the Houses of Parliament and a London bus goes by - the result is still the same!
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