J C Lawrence
1. What is the "ability" of the brown company? (Niederschlesische)
IIRC (my copy is in the car), it does not pay extra for building into hexes which already contain cubes. IOW if building into a city which already contains a cube, and would thus by default cost $3 by default, it would only have to pay $2 for the city hex and no extra for the cube already in the hex.
2.I receive no dividents for "Berlin-Hamburger",until I connect both, even if I have connect this company to another one?
Correct. Additionally that share counts against your income and thus affects your cubes for turn order even though the share (may not) be paying any dividends.
3. What is the yellow"X" that surrounds Berlin means?
There are two ways of looking at it:
1) A company may build into of Berlin, but may never build out of Berlin. Berlin is a dead end.
2) A company may have a cube in only one Yellow-X hex.