I had similar Co-Vid concerns with the Croydon Tramlink, as whilst in the main, drivers were operating in all doors open mode, one or two drivers late at night would switch doors into release doors but passenger operated to open mode, thus increasing number of touch points to be touched by a number of customers.
Tfl Customer Services responded thus:-
29 January
Dear Mr xxxx
Thank you for your feedback form of 20 January the cleanliness and operation of the doors on our London Trams network.
First and foremost, I hope you and your other loved ones are and continue to remain safe during this time. I do also appreciate the time you've taken to get in contact with us and highlight your concerns.
At the start of this pandemic, our drivers were instructed to use the door open button rather than the door release and this instruction still applies. So I've reported this directly to a Duty Manager who has reposted the Operational Notice ensuring that all doors are opened at tram stops and terminus. They've also reminded our drivers to use only the door open facility even late at night when there are fewer customers around.
In regards to cleanliness, trams that are in operation along the network are being cleaned and sanitised every night when they reach the depot. We also carry out a deep sanitation monthly by an external professional company.
Thanks again for contacting us. If there is anything else we can help you with, please reply to this email. Alternatively, you can call us on 0343 222 1234 and we'll be happy to help you.
Kind regards
Axxxx Bxxxxx
Customer Service Adviser
Transport for London Customer Services