There is no need for OpenNet in MRT.
Look, do you see any people who would stay in the station for
like 20mins to browse the web? No. The main thing MRT exists is to
provide transport infrastructure for the commuters, to provide
convenience to us. Not convenience on internet or anything, but
accessibility and connectivity.
I see it as necessary should there be a need (e.g. new
signalling methods) requiring connections with no to
low latency, of course, they have a choice between Internet
(i.e. openNet) or internal networks.