what are the differences between 766.2 and 767.2, I've never been able to notice a difference between the two and why is only the 767 compatible with 218 and 766 not? (in other words, we can only control 218 from 767 cab car but not from 766 cab car. the question is: why? since apparently they are identical)
I wish we only have 2 dostos, but we have plenty and only some work properly in some routes while others no. So you need to know which one you need to use for each route. So I guess that 767 works well on those routes where the DB 218 is available. Also this may be related with the doors opening issue. and as a side note 767 and 766 are actually different as the former is 1/2 class, while the latter is 2 class only.
The difference in real life is that the 766 is second class only, while the 767 is first and second class. The difference in game... depends on which version of each of them you're using, since DTG make updates to the things each time they include them in a route and don't backport most of them.