Covid19 - temperature rising in public transportation

Taking temperature of staff entering building is now a must in many offices and buildings to act as an early detection and prevention to the spread of Covid19.  Staff with a higher than normal temperature are suspects and it is best to separate them from the rest of the staff as a an added precaution. Though a bit inconvenient, this is necessary given the seriousness of the Covid19 and how easily it could spread to people around the affected person.

I would believe that all govt agencies and ministries would also be conducting this temperature check on their staff. What I think is a missing link in this preventive and precautionary measure is to take the temperature of bus and train commuters.  These are the first entry points of people before they were bungled together in packed buses and trains, and if they are already infected, it would be too late to do anything subsequently.

Would it not be necessary and essential for the public transport operators to do this part of the exercise? They have many guides in the station helping passengers to get in and out of trains, a job that in many ways is not really necessary or important than to conduct temperature checks on commuters at this point in time. Or is it too troublesome and would involve too many manpower that it is better to miss this part of the exercise?

What do you think? Commuters in public transport never mind if they are sick, never mind if their temperature rising? Or since it is so burdensome, never mind lah? If there is a case and is spreading in the train or buses, ok or not?