Again, each player may freely decide whether he wants to participate. Experienced players may want to raise these limits by 50 points. When two players decide to co-operate they may also build common lines. Each of those players rolls a die, the higher roll wins and the points rolled may be used for building. A common line should be coloured alternatingly in the colours of both players.
Income generated by common lines is shared.
All bonuses and income are added to the account. After every other transport players may use up to 10 percent of their balance of account to extend their network. The richest player builds first, etc. There is no longer a fixed score for winning. You should take a note of the cities used already.