Sorry, but not thisClass 158?

Sorry, but not thisClass 158?

Nope!Class 159?
Used on urban commuter services near the ends (if you get me).Clue please before we end up having to go through every unit type in the country.
Not this! Doesn't operate near the endsClass 170?
Not this! Doesn't operate near the ends
What does that actually mean?Nope!
Used on urban commuter services near the ends (if you get me).
East end.What does that actually mean?
Not this.Class 143?
You got the reference!Class 317?
Assuming you mean the East End in London
Nope!Class 321?
Not a 387, but part of the same family!Class 387?
C2C run a limited service on the GEML but isnt that with their 357s?
Not a 387, but part of the same family!
Not the 379, but the numbers are so close!Class 379?
Finally! The 378 gangway! Your floor!Class 378?
Finally! The 378 gangway! Your floor!
(PS - it operates in Hackney, which is not too far from the East Ends? Also, its TOC also operates on the Lea Valley Lines)
A 33?