HoHo bus in Dublin

Do you have an actual question? It’s unclear whether you are asking or giving information.

My bad. Asking if one can do this.

I’m a bit confused here. When you say the green line, do you mean the green buses run by DoDublin?

When you say red line, do you mean the red buses run by Big Bus Dublin?

If this is the case, it is unlikely the tickets will be interchangeable as they are two different companies.

Try emailing the two companies and asking them. (Look at their websites for contact information.) Make sure it is very clear from your question what it is you are wanting to know. That way you will get a reliable answer.

When we talk of red and green lines in Dublin I would usually think of the LUAS tram system, not of sightseeing buses.

Some clarification here may help.

Bus routes in Dublin are not colour coded they use route numbers or spine letters.

The sightseeing buses are run by separate companies and are not referenced by colour.

The tram system consists of a Green and a Red line.

Suburban train lines use route names and are not referenced by colour.

Hope this helps.

Hope this helps.

It does for me lezfingal. Hopefully it will for the OP too.