Hey Janete. Focusing on mapping based on Carto seems like a mistake to me. Carto is just one rendering solution. There's a reason we shouldn't map based on rendering.

What we should be focusing on is map functionality. Sure if it is mapped as a funicular it can be seen in iD but it cannot be used easily by consumers. Even without rendering iD provides navigation through them.

Perhaps we could combine the tags? highway=elevator and railway=funicular? It feels jury-rigged and definitely even more mapping for the renderer but it would preserve functionality and visibility.