MRT Restroom Story: Men&Women-always open but not for the disabled one!

There is sometimes I need to use a restroom when I take a ride on MRT blueline.
I have been traveling by using the metro train for very long ago. Just like you, there are some times I need to use a restroom in urgency.
Well, but the disabled restroom is always closed while the rest are all open freely.
There is always a sign stating that “Out of service. Sorry for any inconveniences.”

I don’t know what is the logic behind this but it’s such an incredibly wrongdoing. It should be all open all the time during service hours.