0:12 those are not FLIRT trains they are GTW trains 3:09 GTW trains again 4:04 diesel GTW trains 8:55 diesel GTW trains again 10:25 diesel GTW trains again 11:10 diesel GTW again again 12:05 diesel GTW trains again 13:52 still some diesel GTW trains 15:05 diesel GTW again 15:19 still some diesel GTW trains 16:25 diesel GTW trains I am sorry to say this but i think you have some mistakes about The video title... I think you should change it.
No these are Stadler Flirt DMUs. We have Stadler Flirt EMUs and DMUs. GTW is very very similar to flirt DMUs. As far as i know we don't have any GTW. Estonia should be only (not 100% sure) who has Flirt DMUs
You are mistaken, these are FLIRT DMU units. They do have a striking resemblance with GTW vehicles, however FLIRTs are a new generation of trains. The L in the name indicates 'light', meaning they are lighter by kg per seat compared to GTWs.