Paschim express is surprise candidate.
If paschim exp. doesnot deserve SF status, probably 70-75% of the existing SF trains too shall not deserve the SF tag.
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It is true that Paschim (Deluxe) used to be one of the top priority trains of route after Mumbai Raj, Swaraj (Super), and at par with Frontier Mail(Golden Temple Mail). But today many premium trains trains...
more... with higher speed/lesser stops are operating on the route like AK Raj, Kerala Raj, Goa Raj, many Durontos, many SKs etc. some of ehich overtake Paschim enroute. But it is still Paschim has decent avg speed of 59kmph, is a 24 coacher (1ACI,3ACII,5ACIII,PC,RMS,8SL,3GN,2SLR) deserve to own SF status.