In my smp server, I've been creating a rail system to travel long distances between minecart stations. At each station I utilize track switches to set your destination, and a self start booster to get you on your way. Each station has one of these, http://www.minecraftwiki.net/wiki/Minecart_booster#Switch-triggered_booster
I found that much of the time, the booster cart wouldn't reset above the door properly, so I added an uphill booster to boost the booster cart, which will get it into place most of the time. However, people still have problems with the booster cart not resetting properly, or even disappearing all together.
Is there a more reliable self-start booster I can utilize in my stations?