1. The check for overflow phase occurs after the the oil sale phase. Does this mean that a player can transport perhaps 4 plumes (if they have that number of active derricks) and then sell all 4 plumes, hence avoiding any overflow. The tanks at the oil companies only hold 2 plumes per player. I would have thought that any more than two transported and stored are overflow immediately.
2. Is there any order as too what you must move first - truck or train? Can I move my train up then my truck to take in order to build on wells now available?
1. If a player has 4 derricks, he must take an oil plume from EACH derrick and transport them to market (or spill them on the ground losing it). See page 12 under Extract & Transport Oil. Players DO NOT choose whether or not to extract oil. A player may want to place all oil plumes extracted and transported to market in one storage tank. That way, when he wins the bid and sells his oil it will be a good haul.
2. There is no order to movement of your truck and train. You can move your truck first, then your train or visa versa. Trucks cannot move any further once you've built a derrick. See page 8 under Prospect and Drill For Oil.