Hard to tell from the context (which is scarce). This could be talking about four different display areas where the use of the wheelchairs was demonstrated.

Example sentences:

" From there, visitors move through the exhibit, stopping at stations that demonstrate a forensic technique necessary to solving their case ... "

" characters from the TV show explain the science of the technique through video presentations at several stations ... "

"The kid-friendly spectacle reveals every production aspect, method and use of animation through colorful, interactive stations ... "

" Seven interactive stations with visual graphics guide visitors through ..."

" ... some of our vendor partners will be presenting live demos of their products at stations located throughout the show floor main aisles. "