Its air compressor is most probably of lower rating, as LHB coaches require significantly more compressed air from loco than ICF based coaches.
this is one the main reason why SKD used to get WAP 7 from Mumbai as P4 wasn't able to supply enough compressed air needed.
please wait...Translate to EnglishLHB coaches need way more air than ICF coaches yo! So, the compressor in this one prolly ain't up to par. That's why SKD used to roll with WAP 7 from Mumbai ‘cause P4 just couldn't keep up with the air supply hustle.