http://www.ngltc.org...ot/inclines.htm
Quote:
"At first glance it seems that the obvious way to make an incline is to raise the track by one LEGO� brick for every straight or curve piece. This sort of works and indeed the #4563 Euro Freight Line has no trouble climbing this slope but if you try the #4558 Euro Express or add more wagons to your train you will find that the driving wheels start to spin, especially if there are any curves involved in the incline. You will also find that trains go down this sort of slope at an outrageous speed! Ideally, you should raise the track by only one plate (a third of a brick) per piece of track for a nice gentle incline. The trouble is, you need a frightening amount of track, supports and floorspace to achieve this.
A better solution is to only raise the track by two plates for each piece of track (i.e. 2/3 brick), all my trains can climb this slope. Another tip is to make the change in angle only gradually at each end of the slope by only changing the height by one plate for each piece of track. To put this slightly more mathematically, I have two rules
Rule 1: The steepest slope should change the height by no more that 2 plates per piece of track.
Rule 2: The angle of the incline should change by no more that 1 plate per piece of track.
To start an incline immediately with 2 plates violates rule 2 because it goes straight from an angle of zero plates per piece of track to an angle of 2 plates per piece of track. So you need to go from level to 1 plate to 1 brick. This will become clearer in the diagram further on."