The 2 - HAL only had two coaches per unit (the clue is in the name with the '2' bit)..... Any pictures depicting more coaches will be either two 2 - HAL units or a HAL and something else.
Bachmann have done things like the 2 - EPB and 4 - CEP, although I have not been following model railways of late, so I do not know what else they have done, but certainly Hornby have done a 2 - BIL, a 4 - VEP and a 2 - HAL unit, and the manufacturers generally don't like to over crowd what is already a niche and relatively small market for Electric Multiple Units.
I stand to be corrected however....