These 4 Block Signals Have Been Designed by Bachmann Trains for Added Realism to Your HO Scale Model Railroad Layout. Suitable for Ages 8 and Older. Block signals space trains by warning of trains or cars on the track ahead. FEATURES: Compatible with all HO scale layouts and dioramas. Constructed of black plastic. Upright signal lights. Kit also includes a ladder for each signal and green and red lights. Realistically molded in detail. INCLUDES: Four HO Scale Block Signals kr6/26/01 ir/jl