Rails I'm moving, alike but not identical (7)

I believe the answer is:

similar

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'alike but not identical' is the definition.
'similar' can be an answer for 'identical' (thesaurus). I'm not sure about the 'alike but not' bit.

'rails i'm moving' is the wordplay.
'moving' indicates an anagram (letters are moved around).
'rails'+'im'='railsim'
'railsim' is an anagram of 'SIMILAR'.

Can you help me to learn more?

(Other definitions for similar that I've seen before include "Akin" , "Appearing the same" , "Having a close resemblance to" , "Resembling, like" , "Alike, resembling" .)

I've seen this clue in The Daily Express.

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