Layouts Please browse our current and previous layouts. Current GMRC Layouts Test Track – OO – N – O – HO Armscroft Park – O London Gloucester Road – OO Gweiadur Junction – OO Junior Section Whitall – N Previous GMRC Layouts Western Yard – OO Junior Section Cheltenham South and Leckhampton – OO Windrush – Fine Scale OO Great Badton – OO Three Acres – 3mm