200ml Sistema container. This is one of nine caches required to solve the puzzle so you can eventually find GC52CNT Leprechaun's Surprise. Make sure you note the details on the card and the cache name - don't mix them up 
Please bring your own pen
There is plenty of literature online about the old rail trail, so I wont repeat it here. It is a great ride/walk and is very popular. Do stop to read the tidbits of history, and stop in for a refreshment at the old tea stop on the Wairarapa side of the summit.