Scottnon, sad to say, not many people visit this forum--but if you go to the Model Railroad forums and post your question, you may receive several answers to your question--and then be able to find the ladder that you need to safely work on your layout.
Yes, take time to read thru ALL the forums.
You want a top side creeper from Micro Mark. Google topside creeper micro mark. Used also for working on car or pickup truck engines.