N Scale – Reading 2 Track Tunnel Exhaust System April 24, 2024 by CMR PRODUCTS Puttman Architectural is releasing N Scale – Reading 2 Track Tunnel Exhaust System. N Scale – Reading 2 Track Tunnel Exhaust System (33mm Track Spacing) This is an undecorated 3d Printed building that will arrive on sprues which will need removed. 626-6007_Reading_2Track_Tunnel_ExhaustSystem_2 626-6007_Reading_2Track_Tunnel_ExhaustSystem_3