Sounds like the Engineer seat needs to be on a Tank Car - a Propane Tank car.
Posted Jun 17, 2011 3:16 PM
And not a shell hiding a 20# barbecue bottle, a purpose built Tank Car.
Sounds like you need to go to Manchester Tank and get a couple of semi-custom ~40-Pound Propane tanks built, have them put tabs on the bottom where it'll bolt to stub frames at each end for the trucks and couplers. That way you have enough surface area that they won't chill down and stop feeding.
Start with one of the long skinny DOT Rated Under-floor horizontal RV style tanks, then you don't have as many Retest issues. I have a feeling that Forklift style horizontal tanks would be too fat - but it would be nifty if they just plugged in and clamped down.
My thought would be to hide the Liquid Draw and Vapor Draw shutoff valves and 5% fill spitter and the Ratings Plate under the Engineer's seat at the front of the tank, and put the full-size fill and relief valves at the back with faked "tank car fill domes" to hide them.
Oh, and make sure they are Baffled inside just like a prototype sized tank car, or you'll have Surge issues just like on a prototype sized tank car. You want excitement, let a big slug of Liquid propane get through the Vapor line to the burner....