One of the issues involved is the fact that at manned stations the platforms are also workplaces for rail staff and as smoking in the workplace is not permitted the only way to apply the law correctly is to make all platforms non-smoking.
Not true.
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In Scotland an enclosed area was defined as three walls, a roof, and one open side :
(b) has a ceiling and, except for doors and windows, is completely enclosed on all sides by solid floor-to-ceiling walls
The idea was to also include bus shelters
It was actually an oversight and error that stations were not included
It could argued that some stations, where the smoking ban is enforced, it does not apply as it does not meet the requirement
Example such as Edinburgh Waverley, Ayr, etc as it has two walls, a roof, and two open sides
However, the legislation clearly states :
"public transportation facilities" includes train stations, bus stations, bus shelters, waiting rooms, ticket offices and terminal buildings provided in connection with any public transportation vehicle
It is this ambiquity which has resulted in arguments that smoking is permitted on platforms
Sadly it is NOT the case, but rather than end up in court First ScotRail only enforces in the building structures
Network Rail enforces throughout the entire station
Some, if not all of that, is not true.