Foreign train official on duty at the Vatican (5,5)

I believe the answer is:

swiss guard

'on duty at the vatican' is the definition.
(the Swiss Guard are the Vatican's armed forces)

'foreign train official' is the wordplay.
'foreign' becomes 'swiss'.
'train official' becomes 'guard'.
'swiss'+'guard'='SWISS GUARD'

(Other definitions for swiss guard that I've seen before include "Member of Pope's protection force" , "State protector" , "Pope's protector" , "Body protecting the Pope" .)

I've seen this clue in The Globe and Mail.

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