Tank has over 100k buckets of Creosote oil ..

Steel tank 5x5x6
http://i.imgur.com/s7tQStt.png
WAILAPlugins - 0.1.2-18
Railcraft - 7.0
Forge - 10.13.4.1492

https://twitter.com/tterrag1098/status/633332716189155328

Fixed in 8df1aa4