The same goes if your total income is markedly lower than the others, then you need to change things, an additional train is a good way to do this. Further, if you can get a third train paid fully or almost fully by a company you would want to do it. You should make an estimate of your future income with three trains. If you believe you will earn money go for it, otherwise, stay put. The stock rounds at the end of 1870 are usually quickly completed.
People buy whatever they can get hold on up until the certificate limit and then pass.
Still it is legal to sell shares, and you might even profit of selling your own shares. This sounds strange, because in most cases you want to prefer that nobody sells shares in companies you control. However, at the very end you might sometimes prefer to sell your own shares, even if you are not able to get rid of the presidency. Some of the advice offered here might not be technically possible to implement in all circumstances. In order to succeed in the endgame you need to prepare for it earlier.