The form
A description of something people do now, compiled from published accounts rather than from practice.
Chai is sold in small glasses or cups — historically the unglazed fired-clay kulhad, still used in some places and largely displaced by glass and plastic — from stalls, carts and platform vendors. Servings are small and cheap, and are bought several times a day rather than lingered over. Cutting chai, a half measure, exists specifically so a serving can be shared or taken quickly.
What it does socially
A description of something people do now, compiled from published accounts rather than from practice.
The stall functions as a meeting point, a place to wait, and a site of conversation and low-level commerce. Railway platform tea in particular is bound up with travel in a way that has its own recognisable place in South Asian public life.
Avoiding the picturesque framing
TeaHQ's own reading of well-attested general knowledge, with no single source behind it.
Street tea is regularly photographed and written about by outsiders in terms that emphasise atmosphere over the fact that this is low-margin work done long hours. TeaHQ describes the practice and does not present it as charming.