Perseverance corridor connection brass kit. Type A. P1055 This is a 4mm scale etched brass fret for a model railway coach corridor connection.The set is designed for creating functional, detailed gangways on railway models.It includes various parts like corridor doors, frames, and detailing components labeled for assembly.These are typically produced in 4mm scale (00 gauge) but can often be used for EM and P4 gauges as well. From my late father’s extensive collection. Been stored for years.