I recently switched from PHPBB software to VBulletin, mostly for the ease of handling SPAM, but also for refinements to how questions & answers are posted.
VBulletin is a paid service, costing about 100£/year if you keep up with all the updates. PHPBB is free which lends itself to the try-before-buy methodology, which I did. The Paris by Train forums are active enough that I felt it was time to upgrade to a “commercial” forum software, which has more refinement, features, and especially SPAM protection.
Stop by and post a question that you have on traveling Paris by Train and I’ll try my best to answer it within 48 hours.