TrainMasterModels.com Toggle Search Account Checkout Cart Shop HO Scale HO Locomotives HO Steam HO Diesel HO Electric HO Freight Cars HO Passenger Cars HO Train Sets HO Track HO Vehicles HO Figures HO Structures HO Parts HO Locomotive and Rolling Stock Parts HO Structural Detail Parts HO Couplers, Trucks & Wheels HO Decal/Dry Transfers HO Scale Scenery HO New Arrivals HO On Sale HO Pre-Orders Shop N Scale N Locomotives N Steam N Diesel N Electric N Passenger Cars N Freight Cars N Train Sets N Track N Vehicles N Figures N Structures N Parts N Locomotive and Rolling Stock Parts N Structural Detail Parts N Couplers, Trucks & Wheels N Decal/Dry Transfers N Scale Scenery N New Arrivals N On Sale N Pre-Orders Shop Z Scale Z Locomotives Z Steam Z Diesel Z Electric Z Passenger Cars Z Freight Cars Z Train Sets Z Track Z Vehicles Z Figures Z Structures Z Parts Z Locomotive and Rolling Stock Parts Z Structural Detail Parts Z Couplers, Trucks & Wheels Z Decal/Dry Transfers Z Scale Scenery Z New Arrivals Z On Sale Z Pre-Orders Shop O Scale O Locomotives O Steam O Diesel O Electric O Freight Cars O Passenger Cars O Train Sets O Track O Vehicles O Figures O Structures O Parts O Locomotive and Rolling Stock Parts O Structural Detail Parts O Couplers, Trucks & Wheels O Decal/Dry Transfers O Scale Scenery O New Arrivals O On Sale O Pre-Orders Shop G Scale G Locomotives G Steam G Diesel G Electric G Freight Cars G Passenger Cars G Train Sets G Vehicles G Track G Figures G Structures G Parts G Locomotive and Rolling Stock Parts G Structural Detail Parts G Couplers, Trucks & Wheels G Decal/Dry Transfers G Scale Scenery G New Arrivals G On Sale G Pre-Orders Shop S Scale S Locomotives S Steam S Diesel S Electric S Freight Cars S Passenger Cars S Train Sets S Track S Vehicles S Figures S Structures S Parts S Locomotive and Rolling Stock Parts S Structural Detail Parts S Couplers, Trucks & Wheels S Decal/Dry Transfers S Scale Scenery S New Arrivals S On Sale S Pre-Orders Shop Train Sets HO Train Sets N Train Sets Z Train Sets O Train Sets G Train Sets S Train Sets Battery Train Sets Shop On Sale HO On Sale N On Sale Z On Sale O On Sale G On Sale S On Sale Shop New Arrivals HO New Arrivals N New Arrivals Z New Arrivals O New Arrivals G New Arrivals S New Arrivals Shop Pre-Orders HO Pre-Orders N Pre-Orders Z Pre-Orders O Pre-Orders G Pre-Orders S Pre-Orders Shop Model Supplies Scenery Non Scale Adhesives, Cleaner & Lubricant Scratch Building Supplies Paint and Painting Supplies Decals/Dry Transfers Hardware Signs Tools Other Scales Shop Train Merch. DVD's, Videos and Software Current Collectibles Books - Catalogs Magazines - Calendar Adult Apparel Shop Kids Merch. Thomas The Train & Friends Kids Apparel Kids Books Other Kids Battery Train Sets Melissa and Doug DVD's, Videos and Software Shop Electrical DCC - Digital Command Control Speakers and Sound Turnout Controls Smoke Signals Power Supplies Electrical Supplies Gift Certicates Search site Submit search Nav Menu 4 Nav Menu 5 Nav Menu 6 Nav Menu 7 Nav Menu 8 Home > Shop Electrical > Signals > Circuitron 5521 HO BD-1HD Optical Detector Your Price: $33.99 Please Note: In-Stock Off-Site Warehouse Usually Ships In 1 to 5 Business Days - Delivery Date Determined By Carrier See Terms and Conditions Product Code: CIR5521 Qty: Description Circuitron 5521 HO BD-1HD Optical Detector 800-5521 CIR5521 Share your knowledge of this product with other customers... Be the first to write a review