LEGO Instructions 0138 Whistle Switch for 4.5V Trains
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Trains LEGO Instructions 
Set Number 0138 - Whistle Switch for 4.5V Trains
Your site is awesome! Just built two 20-year-old kits with my two-year old. Even got to see the kits I had from the 60's and 70's. very, very, cool. :) 
Chuck
