Tricky.

A pitfall of the first-time user on the way to work.

Reminds me of that one story from 'I, Robot.' where the (of corse) robot tries to spread the logic equally between the 2 commands by choosing a distance midway between the two.

I had one in the train and one on the platform.

The station is neatly tucked away, on a branch line, between two stations and not listed anywhere on the platform..except for on this map.
The trains are not frequent, giving the traveller time to sufficiently second guess himself.