*A fork system of http://thetekkit.wikia.com/wiki/Teleport_Pipes#Distribution_Transport_Pipe as described above (but without the randomness)
*A loop with Insertion pipes, and then have a buffer of coal, have all the engines full, and then just "top them off" with a loop constantly cycling large amounts of coal
*Redpower retrievers set up a retriever system with RedPower tubes instead
A fork system is probably cheaper, but takes up a large area of space...