If you need more info, Google MRC-Tech-II-Sound-Generator.
You Tube video also.
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
James,
Read through this forum posts in link that will discuss that unit (3) pages. You should be able to understand how to hook-up/wire that unit: Click on link.
http://www.all-model-railroading.co.uk/forum/showthread.php?t=3054
Don't expect too much from that system, it's more of a novelty.
Just so You know......the speaker is mounted near the unit or control panel near the layout......It Does Not go in the engine.....
Take Care!
Frank
train sound 1 by James COUNTS, on Flickr
train sound 2 by James COUNTS, on Flickr