There will be minimal difference between the upgraded Shatabdi and Tejas.
It is better to upgrade the existing branded trains like Raj/Shat etc rather than introducing new brands. There are already too many brands on IR network Raj, Shat, Duro, GR, Yuva, SK, Rajya Ranee, Jan Shatabdi, Jansadharan, Antyoday, Humsafar, Tejas and the proposed UDAY.
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Basically following five classes of trains are...
more... required
Class--------Max Speed------Avg. Speed--Type of Rake----------Coach Classes-- (op) means facility in select trains only.
Passenger--090-100 kmph--25-40 kmph-EMU/MEMU/DMU------GEN(op), SL(op), ACC(op), ACIII(op)
Express-----100-110 kmph--40-55 kmph-ICF existing coaches--GEN,IIS,SL,ACIII,ACII,ACI(op),ACC,EC(op)
SF-----------100-110 kmph-- > 55 kmph-ICF existing coaches--GEN,IIS,SL,ACIII,ACII,ACI(op),ACC,EC(op)
SF Deluxe --110-130 kmph-- > 55 kmph-LHB+better amenities-GEN,IIS,SL,ACIII,ACII,ACI(op),ACC,EC(op)
Premium ---130-160 kmph-- > 55 kmph-LHB+better amenities-ACIII,ACII,ACI(op),ACC,EC(op)