The current player is the so-called public player (you can see there is a world + tools icon left of the red cross (delete) icon). While the public player can build infrastructure, he can't run vehicles. So you will find no line management icon for instance. Switch to the human player, and then you will see the iconbars changing.
I am not sure, but I think you can switch player by using the orange-dot-with-yellow-circle icon. A new toolbar will appear in which you can select a P+ icon. That will change the current player.
Good luck with your "slogging"! I think the game is worth it!