Almost all Subway Corporations in the world are unprofitable.
Why can MTR (Hong Kong) be profitable?
The use frequency of toilets in MTR stations is extremely high, which often generated strong and offensive odour and affected nearby commercial tenants. These tenants needed to lower the temperature of air conditioner and increase the airflow volume of air ventilation, resulting in higher electricity consumption.
Since RHT has installed Ceiling Type NCCO Air Treatment Unit (Model No.: RH-490C) at washroom, the concentration of airborne ammonia, volatile organic compounds (VOCs) and bacteria have been successfully reduced and tenants no longer complained. Besides, due to the frequency reduction of air ventilation, more energy has been saved.