This mod displays the current minecart speed. It can also record the speed so you can walk down the track afterwards and see exactly what speed the minecart had at any point, allowing you to place powered rails at optimal positions etc.
Current Minecart Speed: As soon as you enter a Minecart, something like "Minecart Speed: 8.0 / 9.7" is displayed in the upper right. The first number is the actual speed of the minecart (i.e. the horizontal distance in blocks it moves per second), the second number is the internal "momentum" of the minecart that can be increased even if the cart has already reached the maximum speed of 8.0 (or 11.3 on diagonals).
Recording: To begin recording, press shift/sneak while you are in a minecart. When you walk along the track later, the recorded speed is displayed in the upper right of the screen.
If you sneak/press shift on the recorded path, a full list of all the recorded momentum values (one for each "tick" of 1/20 seconds) is displayed.
The mod now works in SMP, but since it is a client mod and the minecarts are simulated on the server, the speeds are only updated sporadically, so its use for finding optimal powered rail positions is limited on SMP.
Due to a bug in ModLoader, the speed can be recorded at most once per rendered frame. So if you want to make sure that all ticks are recorded, keep the frame rate above 20 fps somehow.
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