Forum:Parser Functions help

Hi I need help on this template (http://rollercoaster.wikia.com/wiki/Template:Trains) on Roller Coaster Wiki. "0" shows up instead of "per train" and I'm confused. I tested it on Corkscrew page. Can anypne help? thanksLachlan5963 Flamingo Land Corkscrew replacement: New GCI woodie! Zamperla kiddie flat-rides Talk 14:22, July 2, 2012 (UTC)
 * Could you show me all possible outputs of this templates? I think I'd be able to simplify the template and fix it. Please leave a message on my talk page when you update this post. Thank you! --Pulse daemon (Talk) 15:50, July 2, 2012 (UTC)