A lady visited my indoor train garden and suggested I plant "Rock Cover," or something like that. She said it would do well in my low light and look nice next to my trains. She also mentioned Thyme, but I thought Thyme liked sunshine.

What do you think?

she was probably referring to 'ground cover' of the type that is planted in a rocky area - thus rock cover.

there are numerous ground covers that you can plant in/around the rocks in your train garden. some like shade and others like sun...

could it have been stonecrop? Just a thought.