Koole's Halliburton Pneumatic Railcar (HWCX)
I found a web site that sells 3D printed items. I ordered the HWCX car and a trackmobile in N scale. The car is fragile and only needs trucks, ladders, walkway, and a brake wheel.  The tanks are split in half for easy painting. No decals are provided.  The price is $26.  It can be ordered in one thru four packs. www.shapeways.com.  search:  HWCX.  Will send another picture after its painted.