Postby Nick » June 27th, 2013, 8:42 am
Sorry, I wasn't attentive.
Obviously, for more trains you need to choose a level with only fast trains. This level must provide the Boost and Add bonuses. Also trains should depart frequently enough because the Add bonus is not always available. The levels 20 and 52 match these criteria. 52 can be preferred because any collision doesn't lead to crash. Maybe there is a better choice.
Nick