Redstone Transport Pipes powering redstone dust and a redstone repeater.
The Redstone Transport Pipe transmits a redstone pulse every time an item passes through it.
Redstone Transport Pipes are very useful for timing other machines using items. When the pipe has an item in it, in turns bright red, like powered redstone. It works like a detector rail. The pipe is very useful for machines that require pay, such as a door that requires 2 diamonds to open. Well you lay down the pipe and set up the door and then it opens.
A good way to use Golden Transport Pipes is to put a Redstone Transport Pipe before the golden one. Once the item passes through the redstone pipe, it will send a redstone current into the golden pipe and your items will shoot through!